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I'd prefer if Ck3 is much more moddable when it comes to such things...So switching to an unplayable tag doesn't immediately end the game, that way people can mod in new governments and such.
 
Republics are a bit of special case. It was one of their first DLCs and republics have very different mechanics from feudal realms. So a lot of things were hardcoded. This is one of those things that wouldn't be done the same way now