It's marketing and it's shit.
And why is it hard to believe that for some people shaving makes them sweat more? Just because for you shaving makes you sweat less, doesn't mean everyone is you - you're not the gold standard! Everyone is different.
I personally shave, although reading this thread has made me reconsider.
I think a big part of the reason I shave is when I got unwell, I stopped shaving - and also stopped looking after myself - so I actually associate it with that. When I'm well, and I start 'doing things' I start grooming myself more. So I think it comes from that association, it's something I do when I start feeling better. So now it starts to make me feel a bit more together. A bit like putting make-up on maybe, I don't know.
Anyway, to me, it's a personal decision. Everyone should be TRULY free to do what they want. If someone wants to shave, fine. If someone doesn't, fine. And these arguments that it's unkempt or unhygienic or messy on women, but not on men, are absolute bullshit. I wonder if men rocking up at the office with leg hair are accused of looking like they came from Castaway?