I'd also like to add the consideration that CK2 is already a game that requires a huge time investment just to learn all the various rules and features and find all of the buttons you can click (just watch youtubers, most of them don't know there's a realm tree button, a dynasty tree, a bloodline ledger, etc). I know because I've recently been engaged in teaching my family members CK2 and they struggle like crazy despite all of them having university degrees. However, they keep at it because even though it takes a hundred hours just to learn the game, it's fun from the start.
But if you then go and make the A.I. significantly smarter and more player-like, as well, the game will truly get a Dark Souls kind of feel for 'beginners' (meaning players with less than 300 hours of playtime, which is the majority). Right now, you can mess up a little, and yet by doing something smart still get out on top. The difficulty is just right for maximum fun for most players IMHO. Especially if you prefer to roleplay instead of conquering (which is most players, I believe) then you will actually tend to remain in the category of people for whom the difficulty feels just right - sometimes frustrating, sometimes things go wrong, but often you succeed in your goals. It's only if you've grown too large and become unbeatable that things feel not challenging enough - and so, if you're smart, you'll draw the proper conclusion and don't try to grow so large but choose different goals for yourself, or different fun limitations such as the CK2 scenario generator supplies.
So, I believe a lot of the "disagrees" come from people who feel that the current game difficulty is alright and they don't want it to be raised. That is a legitimate wish and not somehow a forum failure of terrible people having indefensible opinions: they just don't want it to get harder, they want it to stay the way it is. If the OP had called for adding another difficulty mode with more sophisticated A.I., I'm pretty sure there would have been far more people agreeing with him, because that would be great for experts to have IF they want to. But drastic changes to game design for everyone, to a game that its playerbase loves, are bound to be unpopular.
Another part of the "disagrees" may likely come from people who believe that the original post and some others simply contain a lot of hyperbole and claim that the A.I. is more stupid than it actually is according to other people's experience.
For example complaints such as "A.I.'s not EVER focusing on it's demesne(on making it stronger and bigger and on maintaining it)" just do not make sense to me at all. Does that actually HAPPEN in your game? Do you play the same game I play? My vassals (as well as others) are constantly improving their provinces, building stuff, trying to own all provinces in their dukedoms, fabricating claims, engaging in wars to increase their lands, even marrying their kids to those of other dukes to get alliances and for their descendants to then have claims on the second dukedom. Like, that's what they do all the time, non-stop.
"A.I.'s apparent primitive logic when it comes to deciding when to declare war on u . Declaring a war on u when their army is flat out weaker than yours in terms of numbers and upgrades or declaring a war on u when they are already warring multiple nations at once and losing etc," - how often does that happen?? It doesn't happen to me or the other people I know who play this, except rarely, when the character declaring the war has some personal reason for that war and is acting irrationally (just like people would do in real life).
"A.I. almost never fabricating a reasonable(strong or important) land piece of PC's or even against A.I. controlled nations and thus never pressing either," - Do you have a great spymaster and auto-stop plots? Because if you don't stop them automatically, you'll see that the A.I. constantly tries to fabricate claims on your kingdoms, large dukedoms, etc. and I've also very often seen it press such claims in wars.
I could go on, but I believe this should suffice in illuminating the "disagree"s a bit. Some are simply mostly happy with the A.I. as it is and at most would like a few tweaks here and there to increase immersion, some simply disagree with how the A.I. was represented in the OP, and some were probably a mixture of those two.
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