the.com/necessary
The thing you can't skip without the whole plan quietly collapsing.
means Required for something to happen or be true — not optional, not negotiable, the bare minimum reality demands.
from From Latin necessarius, built on necesse, roughly meaning unavoidable or inescapable — fate with a to-do list.
Logic termA necessary condition must hold, but rarely suffices alone.
Old proverbNecessity, supposedly, mothers every invention worth having.
Sneaky overuseOften softens demands people would otherwise call them controlling.