"Number 12 Looks Just Like You" is a utopia.

"When everyone is pretty, nobody is" is actually a good thing.

With the exception of being forced to be "pretty," and the implied mind alterations. Everything would be better.

Pretty people would no longer get extra attention which can be incredibly unpleasant. And unattractive people would no longer be ostracized and treated as secondhand citizens.

Personality becomes the primary aspect in someone's social life.