1. Well made arguments!
But I have a minor issue with what you think "Friendly" means.
For me, "Friendly" means that there are some bonuses to trade, or that you will
be considered before civs they are unfriendly towards; it's not a guarantee that
they won't attack you.
Nations don't have friends - they have interests - Charles de Gaulle.
2. If Greece is an ally of Russia, or someone else, then it knows about your
warmongering even if they haven't met you.
Do you know all of their allies, and their hidden agenda which might be
affecting the penalties?
3. You are a warmonger.
You said often that "I want to weaken China or Russia or India etc" by attacking them.
They retaliated by weakening you via warmongering penalties.
I'm not saying that the AI is not weak in diplomacy, it is in many aspects,
but there are some reasons for penalties that aren't always obvious.
- Make it to where open borders don't allow one to let their units linger in others' territory for more than X amount of turns. Really, open borders is a license to cover up all my tiles so I cannot move units around. No incentive there. Now I have to kill you to create this plantation guys, sorry.
- And tweak the agendas so that we can actually take action to prevent being denounced. Catherine tells me I'm weak in espionage turn 25. Kongo asks me to spread a religion to him when I don't have one and couldn't have possibly created units and sent them to his cities in that time frame even if I did. Peter says I'm behind in science turn 10 when they start with 3 settlers, a handful of techs, and a % per turn advantage. I have more cities than Trajan but I haven't expanded enough. Perhaps program it to where certain agendas don't go into effect until x amount of turns, or simply fix them.
1) In CIV 4 "friendly" AIs wouldn't attack you (except Catherine if she was bribed) which worked in-game. You need a relevant in-game motivation for "friendly" status to be relevant, disregarding what someone considers "friendly" in real-life diplomacy. Also, yes, nations have interests, but that should mean that nations that are trading with you should get a positive diplo modifier and be less likely to attack you, which at the time isn't happening.
2) You can see at 7:07 that Greece doesn't have allies. They denounced England and are unfriendly with India. They haven't met China which at that moment is the only civ I took cities from. They haven't met Russia either. You can see at 19:50 that Pericles' hidden agenda was "standing army" (which actually gives me a positive modifier).
3) I never said I wanted to weaken India. I did say that I HAD to keep Chinese and Russian cities to be able to stop them from attacking me, because there is simply no other way to guarantee peace with them. This is what I mean when I say diplomacy doesn't work. In CIV 4 you could win games without ever being attacked, even without building an army, by playing your diplomacy right (unless your closest neighbor was Genghis or someone like that). In CIV 6 this is completely impossible.
I think there's a distinction between being "friendly" and being "declared friends". If I'm not mistaken, in the case in the video, China is "friendly" but not a declared friend. I don't see a problem with a civ who's friendly declaring war - as Gimper42 says, in fact in Civ5, often a civ who disliked you would play deceptive and show up as friendly shortly before DoW'ing you, which I think is fine. Of course, they should be less likely to do it if you have a good relationship than if they dislike you, but I don't mind the AI being a bit opportunistic also. On the other hand, if you're declared friend with someone, they should only attack (backstab) you in very extreme cases. Civ5 never got that part right, and Civ6 probably hasn't either (although it's hard to say, given that obtaining a DoF with an AI is next to impossible in this game). I liked the part in the Community Patch in Civ5 where you could not bribe a civ to DoW someone they had a DoF with - the same should be the case for joint wars in Civ6.
I think there's a distinction between being "friendly" and being "declared friends". If I'm not mistaken, in the case in the video, China is "friendly" but not a declared friend. I don't see a problem with a civ who's friendly declaring war - as Gimper42 says, in fact in Civ5, often a civ who disliked you would play deceptive and show up as friendly shortly before DoW'ing you, which I think is fine. Of course, they should be less likely to do it if you have a good relationship than if they dislike you, but I don't mind the AI being a bit opportunistic also. On the other hand, if you're declared friend with someone, they should only attack (backstab) you in very extreme cases. Civ5 never got that part right, and Civ6 probably hasn't either (although it's hard to say, given that obtaining a DoF with an AI is next to impossible in this game). I liked the part in the Community Patch in Civ5 where you could not bribe a civ to DoW someone they had a DoF with - the same should be the case for joint wars in Civ6.
If you have a declaration of friendship they can't declare war on you and you can't declare war on them, the AI can't backstab a declared friend.
There are plenty of cases where geopolitical factors or diplomatic commitments, force two parties into war who are otherwise on friendly terms.
Prior to World War 1, England and Germany were both on extremely friendly terms (reciprocated both ways). Yet they ended up at war.
World War 2 was a little more complicated. England disliked Germany, but I've read that Germany was not that interested in fighting with England since they were of Germanic (Anglo-Saxon) stock. So maybe you could characterize it as Germany being friendly towards England, and England being unfriendly/denouncing back. But that still didn't prevent them from warring (though technically, England declared war on Germany).
In Civ V, you could bribe AI's to war with each other while keeping your hands clean. It was fun, but very exploitable. In Beyond Earth and Civ VI, if you want someone to war, you have to be a participant in the war as well, which is a bit more balanced.
Much of this isn't an issue with 'diplomacy' so much as other AI elements. Regarding the early declarations of war, including those out of character for leaders like Roosevelt, it seems leader personalities simply aren't well-defined even in terms of their constant agendas.
Diplomacy as such barely exists in Civ VI, very disappointingly - AIs are coded to denounce to prevent the player from denouncing back, but no interaction is really possible with civs that denounce you and agreements like joint wars and open borders are disallowed. No one even seems to care particularly if you're hostile to/at war with their friends as they did in Civ V (and to a reduced extent - only really caring if you'd been at war with them - in earlier Civ games), or favour you if you attack their enemies.
All that really influences relations is whether you meet an arbitrary agenda; much of the time when you don't that's largely outside your control and the rest it's not worth going out of your way to appease them (e.g. building up a larger army than a player is ever going to need because civs dislike you for being 'weak' - as they nearly always will as the AI will have more units than the player).
Also, everyone will end up hating you even without warmonger penalties - I was back on Civ VI today, and declared no wars (though I was on the receiving end of many, even there I was restrained and took only two Ottoman cities I wanted. The Spanish repeatedly declare war, launch ineffective attacks on Damascus, then give me money to agree to peace). The cassus belli system as it applies to AIs is pointless - you get 'Formal Wars' or 'Surprise Wars' and that's basically it.
I don't get why people keep thinking Roosevelt is peaceful (like Gandhi).
Yes, the implementation of the Big Stick agenda means he doesn't want outside civs (like Europe) meddling in his own continent/sphere of influence (Latin/South America), but that doesn't preclude him from declaring his own wars within that continent/sphere of influence.
It's been a while since I took APUSH, but if I recall correctly, the Big Stick policy actually did involve the use of military power. And the Roosevelt Corollary (which was added to the Monroe Doctrine) did result in U.S. intervention within the Western hemisphere.
He acted in the Dominican Republic in 1904. And fomented a revolution in Columbia, which resulted in the formation of Panama, in order to secure the Panama Canal.
Civ V had major diplomacy issues (though I still loved the game).
In the early game, AI's would become friends with each other and several cliques of friends would develop. In fact, you could actually get the majority of the world in a big friendship pact.
The problem is that at some point, someone would do something bad and one of the friends would denounce that AI. That counts as a backstab and everyone would get a "you denounced a friend" malus, which might cause them to denounce/backstab that AI. So it would be a big domino chain where everyone starts out as friends, and then everyone denounces each other, for denouncing someone else.
The more problematic agendas are those that punish you for doing well, or punish you for doing poorly. In those cases, there is not much you can do about it and they feel like arbitrary penalties.
You mean Arabian cities? The Ottomans aren't currently in Civ VI. (Unless it's one of the base game scenarios that I haven't bothered with).
The Roosevelt issue is simply based on his in-game agenda - that it doesn't prompt him to behave any differently from any other civ.
It did, but they were issues in execution. The basic system was leagues ahead of anything in any other Civ game - genuine multipartite relationships and alliances that extended to more than favourable trade terms and joint wars. Even the simple fact that leaders cared about others' opinions of you - beyond just whether you'd gone to war with their allies as in Civ IV and earlier iterations - was a major advance, the denunciation system just wasn't the best way to approach it for the reason you mention.
Bizarrely denunciation - despite having no purpose other than to influence other civs' relations with you in Civ V, something it doesn't do in Civ VI, and being a widely-highlighted problem in its Civ V form - outlasted the multipartite diplomacy system itself. Now it does nothing except reduce the modifier for going to war, and AIs are programmed to exploit that by making sure they're permanently denouncing you so that you can't get that bonus
In my experience this mostly happened in games with Gandhi, who was both happy to befriend everyone and denouncement-happy himself. In most games two or three discrete cliques tended to emerge; if one did denounce another member of the player's group other than the player, your best option was to immediately denounce either the denouncer or the denouncee to retain good relations with the other(s) (which is exactly what the AI civs did themselves - some of their relationships would last game-long, as would many of mine).
Is there anything good about the current state of civ6 diplomacy ?