It's not symmetric in this case for a reason. There is no reason why the speaker grills should be asymmetric, it's just ugly. Notice how the antenna break lines up with the camera? Or how the distance between the headphone jack and the side of the phone, and the power button and the side of the phone is the same?
That was kinda my point - somebody said that the iPhone Stretch was asymmetrical and it is. The argument that the 4 and 4S have the same lack of symmetry is flat-out wrong.