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(Clean) leeches are actually pretty handy sometimes.

Bloodletting is standard of care for hemochromotosis; you can use leeches for that, but just drawing blood is probably more efficient; some blood banks will let you donate it, some say no because the donation isn't supposed to be of benefit to the donor.

Certainly, a lot of conditions where bloodletting was used don't warrant it, but it's not altogther bad.

I don't think there's a good use case for a lobotomy, though.