Or we can stick to "medical necessity and ethical practice", which is determinable case-by-case rather than by stupid arbitrary assumptions by people who have no idea what they're talking about.
Should there be a "legal limit" on setting broken bones? Or should be it up to the doctor and patient, based on medical standards of practice?
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There is an issue of putting a limit; outliers exist, and fall afoul of that limit, which serves no practical purpose for existing in the first place.
And no, "assuaging some conservative extremists who have no idea what they're talking about" is not a "practical purpose".