Its not difficult though is the thing, it is for the first time you encounter it I suppose until you realize it can be horribly abused. With the bare minimum in council laws (War Dec only) you can just stack a bunch of loyalists on the council and always make sure Council Power revolts hit at 100-150% which is 40-50% of the 'true' realm power, and easily beat by a single mercenary addition. Ransoms then make it so you'll often double your investment if not more when you factor in siege gold, additional ransoms and prestige if your tribal. Sometimes piety too.
Council Power revolts have inadvertantly led to opening up a NK-Lite playstile where every 10 years you manipulate the council in such a way to your vassals get juuuust enough power to revolt, revolt, lose, get ransomed, and in 10 years do it all over again. If you ever need stability for a long period of time, you can just revoke and give it to new folks who'll love you until they die. You can optimize even further by giving giving consistently 'problematic' duke vassals that hate you titular King titles or better viceroyalties. Republics in particular are also fantastic for abuse since they have nice easily assaulted holdings for warscore and siege gold. For Tribals its arguably even better to do this (Though harder to set up) since you also get prestige and sometimes piety, which translates directly into more and importantly, cheap soldiers to spam in your wars of conquest.
What makes this possible, Vassals favoring Council Power factions too heavily to try and force conclave mechanics and the new combat system which makes combat losses in battle miniscule, so you never really lose anything besides time which is much less valuable ever since Defensive pacts got implemented since you've got plenty of time between threat cooldowns to trick your vassals into revolting so you can fill your coffers.
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