[macintux]

Speaking as someone who's been shaving for 20 years now, it is bad.

More sun exposure, less cold protection.

It has benefits too, but it's overall harmful.

[macintux]

I forgot to mention: a thick head of hair is useful for safety as well. I've had a nasty head wound that would have been mostly avoided, and I've certainly bumped my head on multiple occasions where it was much more painful without that buffer.