It's a bit silly that Viera and Hrothgar can't wear many pieces of headgear, though that's just their version of the limitations other races suffer. You can't have proper eyebrows as a Highlander male. You can't separate horns from faces as a Raen or Xaela. Sure, they could fix the problem for the newer, flashier races but it'd be more efficient to do it across the board or not at all. I know many people who would play a Highlander male if only they could design one with eyebrows and a better looking face. I guarantee, with the physique they have, they'd shoot up to one of the most popular playable races in a matter of months if that happened.