and swimmers aswell.
Well, that's a bit different, since body hair will actually slow you down when swimming by a considerable degree, so shaving all your hair off is an actual advantage for swimmers.
I've shaved the armpits before, but it was exceedingly uncomfortable.
When it gets to growing back a bit it's really itchy, and also really uncomfortable when you decide to let it grow out again.
I also found that when I sweat, I was much more likely to sweat through clothes.
I use anti-perspirant, but it doesn't always save me from sweating. And while I can sweat through clothes even with armpit hair, it seemed to happen much faster, aggressively and noticably without hair.
The only plus side for me, is that if I get sweaty with armpit hair, the hair really clumps together with the sweat, which is very uncomfortable when you move your arms around.
But if your personal preference is to have no armpit hair, then fine.
It's hardly a reason to judge someone.