The focus on flat vs skeuomorphic is partly due to designs being mainly static drawings. Most UIs have additional dimensions. One dimension that goes underused in Android is the ability to share UI among apps through the use of intent filters. That hasn't advanced much since Android was announced. Both Google and 3rd party developers under-utilize this powerful capability. Google makes a vast suite of apps now, and how often do they "borrow" an activity from each other?<p>Then there s the amount of direct manipulation in apps. Viewpagers are nice, but there isn't a lot of drag-drop, especially on tablets where it provides feedback and trains muscle memory. Audio ques, haptic feedback, animation, etc. are all dimensions in which apps can expand interactivity where the visual interface, on handsets, is tiny.<p>Skeuomorphism that is just pictures of things is obviously dissatisfying, but so is a flat UI that doesn't go beyond simple touch.