For Baal's sake! do not take this piece seriously
It is a waste of time.
But women like shaven face (not always, just my experience. Some research I forget says that bearded men are more attractive). So men will waste time to be more attractive. After all getting laid is a central thing in life.
Now it also serves as signalling that you are in the business of women. So you want to look like you are in the talk even if you are remote.
It also signals that you are orderly enough to shave daily, which signals Conscientiousness (a personal;ity trait). Geoffrey miller in "Spent" (great book) says that much of what we do and buy is to signal our personality traits. Having a dog shows you are Conscientiousness as well as it needs constant care (I for one hate doing anything that shows Conscientiousness. The only place to be Conscientiousness is when it brings any real world value)
But the whole question is upside down and silly. Do people live with a utilitarian maximization outlook without exceptions?
Shaving can be enjoyable. grooming oneself is an interesting thing wiht various meanings. It can be kind of meditation relexation. It is always superior to watching TV