The ai is also just fundamentally unable to play the game, it doesn't do anything half the time it can't deal with stress, the economy, warfare it can't even deal with tyranny and education, nearly all mechanics are just impossible for the ai to use. The devs have GOT to know this yet they continue to ignore this and instead focus on adding big flashy dlc with even more mechanics that the ai can't use, it's such a glaring flaw that it's wild to me that the devs haven't even tried to, if not fully overhaul the ai, then at least give it artificial buffs to actually engage with the player. I haven't bought chapter four and don't intend to because of this exact reason, I can't keep giving the devs money knowing they'll just keep pumping out mechanics that are good in a vacuum but simply unplayable for the ai due to the broken foundations of the game. I'm not even really sure the ai will be capable of handling any of the new government types being added because the ai isn't even capable of handling admin or clan at all.
This might be completely unfounded, but I'm wondering if it's a tech issue.
Back during the CK2 days there was a time in which the game was in a much better state, before most of the DLCs, a few people would argue that the best times of CK2 were before any, or at least most of the DLCs.
One of the reasons was because some of the DLCs added too much content that made it easier for the players, like retinues, while they were a fun idea, they never really worked and even though levies weren't trash over there (jn fact, feudal levies were VERY powerful) a giant army of retines could bypass the restrictions of raising armies before wars, instantly finishing some of them before the AI could gather their armies/allies, they were too powerful AND they were extra armies capable of doubling your actual army size.
Which meant, as an example, if you were playing as the byzantine emperor and you faced a giant revolt of nearly everyone of your vassals, as I had (happens when your daughter is a genius and young, so you really want to put her on the throne), without retinues you'd be toast unless you had a very powerful ally like the Abbassid or HRE empires and even then it wouldn't be an easy war, but with retinues you could just start wiping the vassal armies out before they could gather together and beat them into submission without any actual power from your lands, an extreme case that's possible in CK3 with 1/100 of the prep work, but it was still possible.
The other reason was the AI.
Around the time when Rajas of India was released people were flooding them forums claiming the game was broken and unplayable, the game was already having severe performance issues at the time so they decided to expand the map even further, as a result the game was lagging to hell on the best computers, everyone was complaining, nobody could play the game.
Suddenly a performance optimization patch droped and the game ran smoothly ever since.
But some players have noticed something odd... The AI, which was rather challenging and vicious was no longer doing... Pretty much anything, I mean, they were still more active than the CK3 one, but far less active compared to how they used to be, players still call that the "lobotomy patch", this behavior was never fixed.
I wonder if the problem is that they don't know how/if it's even possible for PCs to handle an AI that actually plays the game in CK3 due to performance issues, specially now that they are greatly expanding the map?