Well, we ask why God did this or that. But why should God NOT do these things?

There are reasons for all this, and often becuase we don't know, it's put down to "bad design" or "pointless" "Non functional". Yet the more knowledge people get, the more they realise the reason and the function.

All these things are also a form of protection. Hair also catches dirt/dust. Why do we have eyebrows and eyelashes and body hair? It's a form of protection and insultation. Perhaps there are more functions, I don't know. I haven't made a study of it. Had we pores to sweat and eliminate toxins, but no hair, we would no doubt have more issues because hair also acts as a kind of barrier, catching onto various dust/dirt/particles. Probably far more than we know. Hair is there for a reason, not just "decoration".

These "explanations after the fact" still do not answer the original question of why only male humans have beards.

Jesus Himself had a beard apparently.

Take me for example. I grew up with an overproduction of body hair. I had to put up with thick/coarse/dark hair covering my arms and legs, even as a child. I was taunted for it quite often. "Ape" etc. Yet the rest of my family had no such problem. Why me? I have no idea. I still suffer this, but thankfully there are plenty of methods to remove it. I know there is an imbalance and that maybe why I suffer other health problems also. One thing can often lead to another.