I find it interesting that so many commented about their excessive body odor unless they shave their underarms. Guys don’t shave their underarms and, unless they just finished a work out or working outside or just don’t use deodorant, they don’t have stinky pits.
Also, women didn’t shave their underarms, as prescribed by societal norms, until the early 20th century and deodorant wasn’t used by many people. http://www.smithsonianmag.com/history/how-advertisers-convinced-americans-they-smelled-bad-12552404/
Ultimately, if you prefer to shave your underarms, do it. If you prefer to let the hair grow normally, do it. Otherwise, what is the major hang up here?