Tiebreaker 1: Prefer the loud failure
This is a spec: descriptive guidance, not a checkable rule. It carries no forbidden and instead pair, and no jig check detector applies to it directly.
The spec
Between silent failure and visible failure, choose visible.
A form that discards a submission and shows success is worse than one that errors. A page serving stale data without saying so is worse than a slow one. Silent failure is the most expensive class of defect, because the cost is paid by someone who never finds out.
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