That's an interesting take, agreed. But it doesn't explain why the length... You can still shave hair that doesn't grow too long. And look dangerous to fuck with

Yes, that's very interesting, and I also read about similar studies which explain pubic hair texture as having moisture isolating capabilities. However this doesn't address my question, which is about the apparently excessive length of head hair regardless of texture.

Alright, that's true with the history since long hairs stay for years, good point. I'm not sure I follow with shearing and technological capacity, mind explaining that a little bit more please?

Well... More to my point... That means it's a liability, right ?because that's all fine and dandy when consensual but over the course of history more people have died as a consequence of getting caught by the hair than the offspring such long hair ever facilitated. I mean most military forces cut their hair for a reason. But I'm neither a scientist or a soldier so, I could be wrong too.

Why do we get an advantage from hairs longer than 60cm? 20cm already does the job, it even covers your neck.