I'd like to suggest a change for Multilateralism/Defensive Pacts:
As we all know, late game is often riddled with constant warfare on a global scale due to how Defensive Pacts tend to construct a very complex web. The downside to this is the huge amount of negative stability you gain from running Multilateralism and being dragged in to those huge wars through Defensive Pacts. The AI especially struggles with this, as it wants to both sign a lot of Defensive Pacts and run Multilateralism. I honestly see a couple of options here: Either change Multilateralism's bonus in a way that it no longer requires you to sign Defensive Pacts in order to gain the full value of the civic or just change how Defensive Pacts work later on in the game (or both!).
My first suggestions is that instead of a Defensive Pact giving the 100% income bonus, the bonus in Multilateralism would be tied to having Friendly relations with another civilization. I feel this would still be in line with Multilateralism representing a goverment willing to co-operate with other nations while not requiring you to sign those Defensive Pacts. It would also promote a "peaceful, non warring and welfare civilization" -type of play. Imo you can easily be a Multilateral country even if you don't agree to go full on war every single time any nation happens to calls for it.
And as I mentioned, my other proposal is in regard to how Defensive Pacts work. The current way Defensive Pacts work if I understand correctly, is a left over from original RFC. I do like how RFC/DOC -style Defensive Pacts work for the WW1/WW2 era, and I think they help a lot in creating those global scale wars. And don't get me wrong, I DO ENJOY having a WW1 and WW2, but once time moves on and the game is "past that point", I feel something should change so as to prevent a full on global world war beginning again and again every few turns until the end of time. Perhaps the construction of the United Nations or some bill passed in it could change how Defensive Pacts work from that point on for ex. returning the Defensive Pact rules to vanilla BtS rules or something of the sorts?
This might be an alternative to the Diplomacy Victory, to treat it like a URV with two baseline victory conditions and one that changes depending on your government civic?Is there any chance of having something akin to a humanitarian victory that similarly has a set of three victory goal like URVs and UHVs? I'd like to see something centered around:
Maybe instead of calling it a Humanitarian Victory, how about calling it "Ideology Victory" or "Geopolitical Victory"?This might be an alternative to the Diplomacy Victory, to treat it like a URV with two baseline victory conditions and one that changes depending on your government civic?
liberalism, communism/socialism, and either fascism or a broader "reaction" camp
A big part of the problem is that production in Alexandria is absolutely awful (and alternative cities further east along the Egyptian coast are even worse). Therefore, AI Egypt is very unlikely to manage to build the Great Lighthouse, and AI Greece is very unlikely to build it in Egypt in particular. If you did impose a no-hills requirement, it would have to be in tandem with something that made it realistically buildable in Alexandria without a Great Engineer or it would just never get built at all - perhaps if its hammer cost was very low.I'd love to see the great lighthouse in Egypt more often, maybe a no hills in BFC requirement