> Why not make them right from the beginning?
I don't intend to come off as obtuse here, but this was my original point. Our current understanding suggests this is a design flaw and is "wrong." However, there are plenty of cases where new discoveries have changed our understanding of a system.
So, I'm simply putting forward the question: At what point can we confidently say something is poorly designed? I'm not disagreeing that, based on our current understanding, some systems in the human body seem suboptimal.