I think what we need to understand about helmet-hiders is that they go for aesthetic ideals instead of realism. Their aesthetic ideal of their hero is without a helm, however unrealistic it is (at least I am assuming this is about aesthetics, which strikes me as a safe bet).
I'm a fan of more realism, but I know many people want to play beautiful people for some reason, even though no adventurer would look good very often, what with the injuries, dried gore on their armor, etc. But hide helm is more like an extension of not showing the dirtied armor etc.
Just my thoughts on why that compromise isn't really addressing the desires of either community. The toggle for the visual is more helpful and the realism ones won't mind afaik.
