Struggle is per dlc, we need overral changes to bring what we need.personally i reckon anatolia should be a struggle region. not, you know, an exact copy of the iberian peninsula, different factors involved there, but i think it would help simulate the back-and-forth and fairly unique politicking a bit better than not at all
the struggle system gives me a lot of hope for more mechanical flexibility in the future of ck3 development - ive long been pretty frustrated with the bad contracts under one big title approach to the hre and id love to see that revised. really hope to see paradox mess around with the concept of struggles a bit more, once theyre done fixing all the stuff that doesnt work (i do not want to see them mess around with jack anything until they fix all the stuff that doesnt work)
Having revolts form their own titular titles like in ck2 would help make Muslims chip away at lands during revolts (ie one reason turks dominated anatolia after manzikert), with a ruler then being able to take back their de jure land if strong, rather than just sitting on unchanged land the whole time
The border raid should be part of every culture in game, and the condoterri feature too, as then vassals have more money for mercs for small wars of conquest