Everybody is different, and individuals' bodies can change over time, too, due to hormone fluctuations, physical changes etc.
I think I have a pretty good sense of smell, but I really do not encounter smelly people very often. And I have a very long commute on public transport! I want to know where all these smelly people are. Almost everybody I encounter in everyday human interactions either smells of nothing at all or of perfume/aftershave/hair gel etc. Some smokers smell of stale smoke, some do not. I generally don't get close enough to people to smell their hair, even on the train or bus. I might do a Joe Biden and start creepily sniffing people's hair as they stand alongside me!
It is interesting how some people just naturally start to smell sooner than others and therefore need to wash more often. My mum has never been a daily showerer - when we were growing up, I believe she washed at the sink every day and had a weekly bath. Nowadays, I'm not sure, but I think she probably does a mix of shower and sink wash. She always smells clean and fresh and I get very close to her when I hug her!
When I'm not depressed and wallowing in my own filth and despair, I shower every day. I've never had a problem with armpit BO - daily washing and application of antiperspirant works well for me, even though I'm a sweaty person. However, my bladder is gone all sketchy on me, so I don't feel as fresh in the pants department as I used to do. What I tend to do is have a full shower in the morning and a half shower before bed where I stand in the bath and wash undercarriage and usually also under boobs and under bellyhang
and rinse off with the shower head. In hot weather, I might have a full second shower. I'd love a bidet!
The long and the short of it is people are different. Some of us need a proper wash every day; some can get away with a lower frequency. I do think a sink wash can be perfectly adequate if done correctly, but is much less refreshing. I don't see what make-up, exfoliation and body hair removal have to do with hygiene, as per queenscot's post.