I only know a couple of ciswomen that shave their arms, but most ciswomen don't have arm hair that is very dark or plentiful either. I used to shave mine, but I epilated them a while back and it seems like the hairs that are returning are clear and soft, and if they stay that way then I won't bother with shaving them again.
When I shaved them, no one noticed, so people must not pay that close attention to how hairy arms are. In any case I liked the smooth feeling of being hairless lol, it was kinda annoying to have yet something else I had to do regularly for hair removal, but it wasn't so bad.