Morbidly A Beast:
I’m a pretty hairy guy but one thing I notice as I put on weight is that the surface area of my body expands my hair doesn’t keep up as fast so I have areas where I’ve grown that are fleshy and smooth and older areas covered in hair. I will never shave my body hair that’s for certain it would be to much maintaince and also when you shave hair comes back thicker and denser
Fun fact! Shaving does not make your hair thicker or denser. Instead, the way your hair is cut gives the
illusion that it's thicker and denser.
Normally, your hair tapers off towards the ends. Like so:

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However, when you shave, you cut the hair where it is thickest. So, when it grows, it appears thicker:

That said, over time, normal wear and tear on your hair will give it that tapered look again.