That’s because Pandas aren’t that popular(I like them) so no one is screaming at the top of their lungs like they are for Void Elves.
I also still disagree with giving Void Elves the same hair colours and styles as Blood Elves. There would be nothing different from the two then. Unless Nightborne get all customization options that Night Elves have to make it fair. Again this is just my opinion and if Blizzard does it then tough luck to me eh? =P