I have to say that this is awful. I'm only three generations into a game and already I have two super dukes and a count that owns 8 counties personally scattered all over my realm. This almost purely off of dukes and counts marrying each other and their eldest child inheriting both titles. There's no way for me to reasonably break these up! My vassals just get bigger and bigger at an extremely high rate. The only time this doesn't happen is when most of them happen to have first borns of the same gender. The vanilla game generally doesn't have this problem because the rulers are almost all men, but almost everything defaults to true cognatic in EK.
I can understand why independent counts and dukes might need primo to grow, but why can't vassals ones use gavelkind? Are you just expected that every other generation you need to revoke half your vassal's titles if you want to keep them limited to single duchies or from going way over their demesne limit as counts? And if that's the case, how? Is replacing most of your vassals every century how the devs intend you to play the game? The best answer I had for this in previous versions of the game was to request gavelkind, it was pretty much the only thing I could justify giving a favor for. Gavelkind is the only reasonably way I've found so far to break up super duke vassals faster than they inherit more titles without generating huge amounts of tyranny.
I can understand why independent counts and dukes might need primo to grow, but why can't vassals ones use gavelkind? Are you just expected that every other generation you need to revoke half your vassal's titles if you want to keep them limited to single duchies or from going way over their demesne limit as counts? And if that's the case, how? Is replacing most of your vassals every century how the devs intend you to play the game? The best answer I had for this in previous versions of the game was to request gavelkind, it was pretty much the only thing I could justify giving a favor for. Gavelkind is the only reasonably way I've found so far to break up super duke vassals faster than they inherit more titles without generating huge amounts of tyranny.