Same thing happened with Viera, they were supposed to only get race hair.
There's also the fact that they made that choice (ONLY Race hair for Viera, no changeable Hrothgar hair but new manes and "faces" for them to potion to) waaaay BEFORE they decided to add in the missing genders. IMO it was THAT choice that made that path too hard. It may not be too much to add in, after years, 4 new Viera race hairstyles and 4 Hrothgar manes that are custom fitted & locked to their face/ not useable by other faces. Base Hrothgar manes are ... basic, they don't even have highlights. But adding in Male Viera and Female Hrothgar literally 2xs the amount of new, custom hair they would have to make.
It becomes far more logical to just make the shared hairs work on these races at that point and scrap the idea of unique, racial hair when you gotta do it for both genders of both races. There's also the years of people begging for shared hair and changeable Hrothgar hair to take into account. Plans can change, this is a living game ... it's never done. These races were never meant to have the counterparts when they were being made, any plans they had for them before deciding to add them can understandably be changed.
