"Judgment requires deciding which signals to ignore.
In a review meeting where a decision keeps getting deferred, everyone wants to keep options open. Options are expensive when they prevent commitment.
Indecision is rarely neutral. It shifts the decision to the calendar, to the loudest stakeholder, or to the person who is least able to say no. The team feels motion, but nobody owns the boundary. Clarity is not certainty; it is a small commitment the team can execute without reopening the decision at every update. If the exception path is informal, it becomes politics; write the signal that makes an exception legitimate and who can approve it.
State the non-goal and the boundary that keeps scope from turning into a rewrite. That is how you stay decisive without pretending to be certain. A clear line beats a long explanation.