The wiki tells me that the faction stops being a high priority if the council has the power to vote on laws and wars, but it's still stupid how it's done.

The problem, I think, is that there are no criteria barring vassals from the 'empower the council' faction except for opinion thresholds: Any vassal with an opinion of less than +50 will join the faction and they won't leave unless they're +80 or above. That is too many revolts, especially since I am an experienced player who was using opinion thresholds, bribes, non-aggression pacts, and my spymaster to keep my vassals out of that faction. In just under four hundred years of gameplay, I have had twenty-two factional revolts to 'empower the council.' Considering that it took me maybe seventy-five years to disempower the council, after I got bored of buying favors from my vassals to do the basic business of rulership, that is a revolt every fourteen years. The council system from the Conclave DLC is cool for maybe fifty years and then is the dumbest and most annoying busywork in a Paradox game since calculating supply weights in Victoria 2.Most of my praise of the game as it is currently still stands, but I have a few sharper critiques: Okay, I'm about ten years away from a complete 1066 to 1453 playthrough as the Stenkil kings of Sweden.

Ck2 too many vassals