...This is getting ridiculous. Civ Flavour Diety only adjusts building flavors. This doesn't suddenly make the AI capable of diplomacy, decent unit movement, city placement, or anything that actually requires the AI to look at a situation and adjust accordingly.
Vox Populi doesn't make the AI perfect. It isn't human. But the one thing it does is make the AI capable of playing a game where others can affect their civilization. They make sensible and advanced deals, declare war when it will benefit them, move their units well enough to at least hold their own while advancing against weaker fronts, and actually feel like they're all playing their part in the world.
VP removes AI bonuses because the AI no longer needs as many. Not being confined to singular plays leaves the game open to interpretation. Not massively, since there's still good and bad plays, but enough to make it feel like it's not a damn sandbox since the AI will adjust to the situation well enough to continue towards success.
Yes, it is indeed getting ridiculous that you condemn a mod you haven't even played with.
I, on the other hand,
have played with Civ Flavour Deity, and even though I haven't played with it a whole lot (found the mod relatively short before the Rise and Fall release and it needs to be updated per civ first), I noticed a
significant improvement in how the AI played.
In regards to your other points:
1. AI has always been capable of diplomacy, I have no idea where you get the idea from they aren't. And if you disagree with me, show me why.
2. Turns out unit movement wasn't that much of a problem after all if they had good units, which they do with the mod. Also, this got improved in R&F, and I can confirm it worked from my own games with R&F.
3. I'm not certain, but I think city placement is also affected by Civ Flavour Deity.
4. And it turns out that if the AI has better resources and a better empire, it also has a better view of situations. We as a community just broke the game by finding more optimal ways to play than the devs had expected, which gave the AI an innate disadvantage in situations, making it look dumb where it would have been the right choice if they'd had an equal economy.
And stop defending Vox Populi, I haven't said anything against the mod, except that I got a headache from the UI. That's also everything I
will say about it, as I haven't played enough with it to judge it's contents, but I trust what I hear from people saying that it greatly improves the game.