Been growing facial hair since I was 14. In fact, I asked my dad for a razor and he said "There is no way you need a razor yet" because he couldn't even grow a goatee until he was 30 (my mom got me a razor right away). He's 60 now and can grow a "full" beard but still has very little body hair. However, I could grow a fuller beard by the time I graduated high school with body hair to match. College was mainly goatee years and by grad school I had transitioned into "full" beards, as I had gotten way more complements over the goatee. My wife definitely prefers the beard to my baby face without it, even if it makes her itch.
At the same time, my beard always itches to some degree, and only gets worse was it gets longer. I also hate the routine of shaving. But I also hate trimming my beard, even though I prefer a short, full beard, as cheap commercial trimmers just aren't sharp or good enough to prevent half-cut hairs and split ends. So I generally go through cycles of a few months, trimming down to stubble (sometimes a full shave - there is a nice clean feeling afterward - followed by razor burn for a few days), then let regrow. I might trim it down a few times until the quality of the beard decreases and requires starting over.
And since partner hair preferences keep coming up, given the amount of hair I have, both on my face and body, I refuse to do anything else but an occasional minor trim. I tried trimming everything down to nothing once and the regrowth process was full of itching and chaffing I refuse to repeat. I'm not a hypocrite though, so I never complain about my wife's hair, and I have zero problems with it anyway. It's natural to have hair as we all have hair everywhere, just some much finer or lacking pigment. Keep up with hygiene and there's no problem.
We still universally have body hair (the thick kind) in a few places, and my understanding why we've kept them evolutionarily is that it's due to temperature control and chaffing reduction mainly. On our heads (not faces), our hair provides something to hold our perspiration when we are hot and allows our heads to keep cool (our brains do not like temperature changes), and conversely keeps our heads warm when it is cold (not to mention UV protection that hair provides). Under our arms and between our legs, the cooling part still applies (especially to us men - our sperm require lower temperatures than our bodies (80-85 deg F versus 98.6 deg F)) but probably not so much heating. But anyone who has trimmed, shaved or otherwise eliminated hair between their legs probably realizes that the hair prevents our skin from rubbing on itself and chaffing, which is way worse when wet. I imagine we have kept facial hair in general to keep our faces warm/cool, but sexual selection has preferred women with little to no facial hair and men with facial hair (as men don't get facial hair until they are sexual mature).
