What I meant is this: On iOS 1-6, the UI is very clearly UI. The rectangle between navigation bars, tab bars and status bars is the content. It's like looking at a snowy landscape through a heavy, wooden frame.

On iOS 7, everything blends together and I don't see how this puts the focus on the content. E.g. in mail, the scrollable content has almost the same colour as the bars above and below it. How is it more prominent now?