As they currently are, they serve nothing other than to make the game more annoying. I'm currently playing a Megacampaign and I constantly have to reload due to dynasty members that I have placed on other kingdoms switching to cadet branches. As it stands, Cadet branches function like a totally new dynasty, rather than a branch of the main dynasty that still has familial ties to the original dynasty. In turn, alliances are broken. It will also be annoying going into the EU4 portion, as it will be much harder to place those kingdoms under personal unions (which I intend to do).
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