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".

Jesus Himself had a beard apparently.

Did men go out hunting more than women and require thicker hair as a result? Is it possible that this also came about after the fall, when men were required to work from the sweat of their brow? Or even later? Or perhaps it was there all along? I don't know the answer to everything because I wasn't there.

God would not have intended women to have "beards", because most of us don't (you get the exception of cause, but they are often an imbalance). But because women don't have beards, that does not mean God intended them to have no hair follicles on their face or anywhere else. Instead it is most often downy/soft/fair and barely visible, rather than coarse, and still provides a form of protection.

We must also remember that how it was in the beginning, to how it became after the fall would have been VERY different once sin entered the world. So we can't really KNOW for sure whether the first man walked around with a full beard or not.

There are PLENTY of cases of hormonal imbalances. Even just a "tilt" can cause an overproduction or underproduction. So it's not bad design at all, but we are reminded continually that we don't live in a perfect world, nor are we ourselves perfection. Defects are everywhere.

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.

God has His specific reasons for how He created male and female. I think He did a very good job too! It is not Him that made things imperfect - we can attribute that to sin entering the world as we were told. What that has to do with hair or no hair? Not alot, but imbalances do!