"Expertise can become a liability when conditions change.
Drift is a chain of permission slips. In a metric proposal that will change incentives, each one is small, defensible, and easy to repeat.
In a metric proposal that will change incentives, the argument will be that you are “unblocking” the team. Unblocking without a guardrail is how you create debt that cannot be paid down quietly. Do not hide the tradeoff in prose; make it two lines so it stays readable when time is short. Be honest about what would change your mind, because without a revisit signal every decision becomes permanent by default.
Gary Klein is a reminder to audit the argument, not the intention. Draft the future critique now: how this fails and what justification you will be tempted to use, then name one guardrail. Make it falsifiable.