The AI appears to be playing better. The game rewards aggressive play and offensive conquest and the AI now does so regularly. If the AI conquering up a storm and trying to blob is a problem, why is it not a problem when any human can do so? Single player maps are starting to look a little bit closer to multiplayer, and that's great for having a bit of longevity on the difficulty side but obviously troubling if you're into some kind of historical realism roleplay.
They could probably "fix" it by adding a third difficulty option to set AI aggressiveness. Maybe a passive, cautious, normal, and warmonger level. What would be really unfortunate is if they change the AI's aggression without altering any of the underlying motivations that reward it, which would effectively be an AI nerf. If you don't want the AI to be constantly conquering and warmongering, then you either want a game that has harsher drawbacks for it in general or you just want a game with weak AI.
It's a shame this basic issue, how to motivate the player NOT to expand as fast as he can - is about as far from being resolved as ever, despite three sequels, countless new features and the sheer volume of water under the bridge.
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