Think of it as a radical body modification. Suppose someone wasn’t really a fan of having hair at all and wanted to just not. Most of the scientific research on hair loss has been about stopping or reversing it, but in all that research have we learned whether we could cause it to happen on purpose? I don’t mean conventional hair removal, and I don’t mean laser or electrolysis which both have significant limitations and wouldn’t be feasible for total hair loss on the entire body.
I mean like a vaccine for hair, an injection someone could take that would cause their immune system to attack all their hair follicles in the same way we see in alopecia universalis, so they have literally no hair at all anywhere on their body permanently. It feels like it should be possible, especially now with the increasing use of mRNA vaccines.
Interesting questions. It would also remove eyebrows and eyelashes, which serve to protect eyes from dust and things like that. Armpit and pubic hair serve to reduce friction in those areas and prevent chafing. Nostril hair, assuming it would also be gone, is part of the filtering system of the air we breathe. Considering all those health implications, being fully informed before doing it would be really important.
But if someone still wants to do that to themselves, and is an adult capable of making their own decisions, I say let them!
Whether it’s possible or not (the core of your question), I have no idea but the other comments seem to have some theories about that.