Look, I understand that culture is tied to tech and there are players that hate it when their culture spreads because of it but they're people like me who want to spread their culture and at the moment it's nearly impossible to do that due to how restrictive it is. The only realistic method to do it at the moment is to do is to form Outremer empire and embrace Outremer culture due to the AI culture conversion buff which is really limiting and boring to wait for holy wars to unlock to do it but, adding this buff to communal identities whose whole gimmick is that the religion and cultures ideals are interlinked it would make perfect sense for an AI with this tenet to have the buff and after converting the religion to seek to convert the culture. This would allow players to use custom characters with dead cultures and bring them back to their former glory as well. Also, no one picks communal identities anyway since both ritual celebrations and Esotericism does it's job better due to how restrictive the AI is with culture conversion no one really cares about the culture conversion buff since the AI never does it anyway and spreading it yourself is way too slow so this would give it its own niche.