i have always thought there is need some Rise and Fall mechanic, but it should be more comprehensive. Especially when there is great empire wars and culture changes. Architecture local art, should somehow survive even if new civilisation takes over. Like Constantinople often changes hands, but it root culture, art and architecture survives and every new owner leaves mark on it. thing that paradox didnt do in ck3 was civilisation independent technology trees. If you build barracks its same for everyone. if you form MAA groups its same sized