Fundamentally the point of cultural unions is to differentiate how you assimilate foreign cultures vs very similar cultures, since you very much want to be assimilating them, what with how the price to accept cultures depends on their size relative to your primarily culture.My problem with cultural unions is that they feel like sort of a nothing mechanic. Like I reach a certain point and then suddenly accept everyone and then that's my culture group dealt with for the rest of the game. When in reality I think culture, especially local non-primary cultures, should become more important over the course of the game, as we shift away from medieval views of culture and towards more modern views.
I don't think culture unions do that very well, but I very much believe that there needs to be a mechanic that does this. Castilian assimilating Aragonese should have the possibility of being very different than them assimilating Andausian. And in addition, Aragonese was historically assimilated, it wasn't just accepted.
(Sorry about double posting, I should have kept reading before posting)
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