I think that Amber Rose serves a very unique purpose in the game. Although it is sizable, her ass is by no means the biggest thing that she brings to the game. Instead, it's her ability to draw acceptance for short hair. Attention is drawn away from faux or real flowing hair. Instead, the audience looks at the definition of the facial features. Emotion can be expressed so much more candidly.
Sure, she may fall off if her and Ye cool off. Nevertheless, her 15 minutes are much appreciated.