I'm going to limit this to only talking about some body hair since, as the big boss here, I think it might get too weird otherwise (right?).
I was first asked to shave (armpits and legs) by my mother back in the early 1980s when I started getting body hair. I really didn't want to, so what I did was basically only shave when I couldn't hide that part of my body. Even though I was never a big fan of hers, I remember feeling secretly validated by photos of a younger Madonna that came out somewhere in those years that showed her with unshaved underarms, and as much hair (mine is pretty thick, not some delicate wisp) as I had, no less.
When I left that house in my mid-teens, I stopped shaving under my arms totally. I only have in the decades since on pretty rare occasions, and mostly that's been about work-related things (not this job). I almost did again in the early 90s at a job where they made me -- no kidding -- wear long sleeves and pants in the summer since I didn't shave (but made no such requirements of the male teacher I was working with at the time, because of freaking course). But I was just not willing to give that up for that bunch of you-know-what. I also have very sensitive skin and it's painful for me when hair grows back in there, having underarm hair is part of my gender expression, and I find that -- kind of like I feel when I take my glasses off, since I've worn them most of my life -- I just don't really feel like myself without it. I've also had some partners with a very emotional attachment to it over the years, though I don't think that has much to do with my choices.
I do often shave my lower legs, mostly for what maybe seems like a super-weird reason, which is that I just don't like the particular hair pattern on my legs. For whatever reason, my leg hair comes in like a Clydesdale horse's, with very little on my calves and a thick ring of it around my ankles. It almost looks deliberate, and is apparently weird enough that strangers have asked me when I haven't removed it if I do it on purpose. I've never had such direct questions about my underarm or any other hair from people I don't know, and I really don't like that kind of attention put on me if I can avoid it, so I mostly just avoid it with a razor in places and seasons when that hair'd get seen.
Like Kaizen, I also do like how my legs feel smooth, especially how to feels when fabric, like from pants, is touching them. In a similar vein, I've always liked how my underarm hair feels, too, so it's probably safe to say that tactile sensations inform these choices for me to some degree.
I should probably mention that on the whole, my body hair is pretty light and pretty fine, and I'm a white, average-sized person. I recognize that there's privilege in that, and that it's hard to say what kinds of choices I'd make around this stuff if I didn't have the privilege I do. I do know that it would probably incline me less to leave my underarms alone, for instance, just because I might have to give up or deal with more crap to do that.