I would love to do haircuts. For me, I would never change more than the style and maybe warpaint+dirt.
But if other people want to change the entire appearance so be it - its not that easy to get the character 'right' in the editor. They often look very different depending on armor/lighting etc..
I have one character in particular i can't stand playing anymore cause I gave her the stupid anime 2x pigtail look, but she is also one of my favorite builds. If I could change her hairstyle again i'd be stoked.
And if they did do this, I would have to go back on my proclamation that I'd not by anymore new software from them. If they made a barber DLC that worked and wasn't ridiculously priced I would definitely still buy it. Hell if they released it for the older titles I'd go back and by it there too.