Noticed a nice (suggestive) bug in iOS 7.

Whenever I load certain apps on iOS 7 they don't quite fit the screen properly. They seem to be shifted a few pixels to the left (which then corrects itself) ... but I noticed that the app fills the screen, even under the icons at the top, and it looks pretty nice.

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Apart from the corners on the Twitter example, I think they look pretty good. What do you think? An upcoming design option, or just a bug?