[glenra]

There are two problems with it. (1) Functional: if the glass sticks up a bit, it's more likely to shatter when you drop the phone face-down, than it would be if the glass face were flush or even inset. (2) visual: It destroys the symmetry when looking at the phone from the side.

[Evbn]

SJ was certainly right about one thing: if you don't like the asymmetry of the look of the phone from the side, you are looking at it wrong.