I wonder whether having an appendectomy is prophylactic, as in they'd have experience with surgery and recovery, although comparatively minor, and would think a half-second more about doing the dick blender. I'd expect a deep laceration, a finger reattached after trauma, or a C-section would make a potential SRS patient think twice: like you said, if your finger still ain't right, what could that mean for a dick/clit? They might still go for it, but maybe there would be more realistic expectations.