I'd be worried about itch too. Would never shave my under arms.
I've had my chest waxed quite a few times. Never had to do my back, as I don't have a hairy back. But my chest and stomach hair is a veritable force.
Also generally clipper my pubes, and used to clipper my face, and just shave my neck. But then decided that the neck is the worst part anyway, so I just razor the lot, probably twice per week. But my facial hair is black and grows really fast, so comes back really fast.
Speaking of your pic some more, the mother******* combover is back in a big way. I've been rocking one myself the last week or two some days, although it's a LOT shorter, and also slightly back and across, and also a little messy.