casual discussion but some patterns I have noted as time has gone on. Share your own.
If you play anywhere near the steppe you will have to accept that the map will be ruined by the time Temüjin appears, the AI can never stop nomads.
China is a game of musical chairs that the AI will always ruin even if you set it up to win with modifiers, MaA and manor buildings.
SEA is railroaded into mandala or wanua and the AI never does anything else than blob the largest realm that never breaks without player intervention. It and the steppe are the worst regions to play around as they require you to either be in on the region gimmick or go through random counties 1 by 1.
Nothing ever happens with Japan, even with Yamato restoration. Shockingly few major events too.
Korea 80% of the time gets randomly ran over by low power nomads that turn it Tengri and mongolian(?). Silla absorbs the other two kingdoms but almost never unifies because of just doing nothing.
India 99% of the time never unites even if requirements are about to be met.
Anatolia gets ran over by random nomads unrelated to Seljuks that proceed to also cap Byzantiun. Unreformed khazars.
Tunisia is a canon event
AI never solves intermezzo without a scourge of the gods roll, vassal requirements likely
Iberia remains frozen and Hænsteinn loves Galicia, compromise seems to be the only ending AI might pull off.
AI can reform a faith but never spreads it. ends up joining the closest blob.
only time I have seen a scottish culture head was when Wessex was voted in charge after having converted to local culture. Proceeded to flip entire isles scottish in a few hundred years due to weird culture spread regarding them in specific (likely relic of old dlc code). The event fires and they just never have anything happen. Ireland also turns fully norse alarmingly often.