There are some hairs that only make sense for certain races, like how there's a few Au Ra hair that includes extra horn bits, but for everything else the devs don't seem to care that much that I don't mind SE spreading around.

A 1.0 Lalafell-exclusive hairstyle ended up on Miqo'te in ARR. And there's a bunch of other hairstyles on Miqo'te that are also made with normal/pointy ears in mind so there's awkward gaps in the hair where ears should be. But stuff like that has been around for 10 years now so it can be up to player discretion if it looks too weird.