So birds dont drop little bombs onto your scalp.
Does it directly effect your health? No. But it can be argued that having a full head of hair is like having a full set of teeth.
I like having a full head of hair, but it doesn't bother me when someone else doesn't.
I'm glad I still do, but I wouldn't think badly of someone who didn't.
I will say not that important. I have enough hair for 2 people, no joke.