I love the fine hairs. Amount of fine hairs is an indicator of how prestigeous the tea is. So I often greedily examine the tea in a glass and hope for more and more fine hairs
As for rinsing, I "rinse" oolong and puerh, but not other teas. For oolong, I would call it "warming up" but not rinse, because I do drink the "rinse" water.
(Oops, I cross-read posts! I meant to say, I have opposite feeling about the fine hairs in white tea or some green