But whats the implication because you know that isn't the norm, or the route taken in every game. That would be fun once or even a handful times. But I'm not going to want to resort to just owning 11 provinces, controlling everything else through the council and then burning everybody else. And in those games where I don't want to burn the world as an emperor the frequent and feverish desires of of the democracy league are utterly annoying.
I don't want to put words in the poster's mouth, but I believe the point was that if you can reign peacefully despite going out of your way to make your vassals angry as possible, you can certainly do likewise in a game where you
aren't randomly imprisoning and executing people right and left. just to try and see how high the tyranny modifier goes.
Give them War Declaration powers, and the top X vassals (where X is how many council slots you fill with powerful vassals) are generally unable to faction. If your realm is such that the top X vassals are the ones that matter (e.g. vassal kings), then you are good to go right off the bat; no one else can hope to form a faction large enough to matter against you and the Big X.
If you have enough powerful vassals that this won't be enough to prevent factions from getting strong enough on your own, then you can marry off excess siblings/children/aunts/uncles/nephews/nieces to get Nonaggression Pacts with a few more. If you pick individuals reasonably low down in the succession order for your diplomatic marriage, you can even use matrilineal marriages to increase your dynasty. Anyone with a NAP will drop out of factions. Just note that you will have to renegotiate NAPs after you or your vassal dies, even if the marriage/blood tie still exists.
Between these, you can generally avoid factions getting large enough to fire, even with huge empires. The spymaster is just gravy, mainly for vassals that hate you so much they won't agree to a NAP. The AI has trouble managing it (which is a valid point), but ironically Conclave means the player can basically shut down factions to a greater degree than any time since they were introduced. The only reason you might have trouble is if your council goes discontent (either on succession or because you ignored the council, e.g. by declaring a war they were opposed to), and even then, your extensive network of NAPs with your vassals should allow you to weather the storm
And of course, since so many of the council power factions are for meaningless demands, you can safely give in to ones you don't care about, while the focus on those factions prevents them from forming factions about things like succession that actually matter ("Have I even banished anyone once this game? Sure, you can have that power").