Quote Originally Posted by wereotter View Post
This may not be a reason... but what I've heard from people who use mods for the game is that viera hairstyles are actually stored in a different location in the game (forgive me if I'm wording this wrong, I'm not well versed in proper lingo) than other races, occupying the same spot on a character model as the legacy tattoo. Apparently they weren't able to do certain modifications without also removing that tattoo from the viera model. Depending on how many items can be stored into memory for that character customization slot, it could explain as well why the number of hairstyles for viera are limited, as well as why every new hairstyle doesn't immediately become available to them.

Specuating here... but it's also possible that they know immediately that not all hairstyles will work with every set of ears, either with the hair being so large as to make the lop-ears clip down through them, or with the hair being so short cropped that the ears would float off the top of the head.
Why does SE do things like this? That would actually explain why they would only add a limited number of styles, even if they were going to add any. I've speculated for awhile that they would have to do a full on overhaul to "fix" these races, and it makes even more sense now. They really did these races dirty, I think.