Long ago I read an article about how anxiety also isn't a malfunction at all, but an evelutionary response. People who are anxious are more likely to react to things that other people would ignore, thus having anxious people in your tribe is beneficial, because they are kind of like a siren. If Uhng smells smoke he will just roll over and go to sleep. But if Rohg smells smoke he will look outside in a panic and see that Uhng's tent is on fire, and then warn everyone.

I think we all have our place in this world. the only reason it's a "dysfunction" is because we don't fit into the box that society says everyone should fit into. Humans were meant for smaller tribes, and in smaller tribes we are all important with our different talents.