Choose which holding to cut loose this season, and who inherits it, because every faction watching you retreat is recalculating whether you're still worth serving before you decide what to hold next.
The Europa Universalis and Victoria 3 veteran who's hit the wall reviewers named out loud: economies dense enough that you end up "forced to automate" the parts you wanted to play by hand. Retrenchment is built with fewer holdings than decisions, so there's nothing left over to hand to the computer.
The Crusader Kings player who's always liked the succession crisis more than the conquest, and anyone drawn to imperial decline as a subject. Nobody in the genre has made "manage the shrinking" the whole game instead of the thing that happens to you when you lose.
The Ledger flags a holding in red. Cede it to a named successor, Devolve it to autonomy, Hold it at full cost, or spend two Crisis Actions to Reclaim one you released too soon. One Ledger, one decision, and never more Crisis Actions than there are fires to put out.
Every 25 seasons a Succession fires: your Writ ceiling drops 10%, non-negotiable. The warning comes early. Surviving it means you already shed enough upkeep before it landed — the game gets harder by taking away what you relied on, not by throwing more at you.