Confusion becomes expensive when repeated at scale.

A small confusion is trivial once and expensive a thousand times. An unclear instruction, an ambiguous label, a form field nobody understands, each costs a few seconds and a little frustration, and multiplied across everyone who encounters it becomes a significant loss that never appears in any budget. Scale is what converts a minor annoyance into a real cost.

When something confuses people repeatedly, fix the source rather than answering the question again. Count how often it comes up. That number is usually enough to justify the time.