I'd like to add this to any "forms over function" discussion:
There are still physical buttons on the current and likely future iPhones. Out of aesthetic reasons the power button is symmetrically opposite to the volume + button.
Last week my wife told me how she hates that arrangement, because she often hits the power button when she wants to change volume. That happens because in order to push the volume buttons you need some opposite force, which often happens to land said power button.
This is no real surprise, because your index finger and thumb naturally land opposite to each other when you hold and/or "squeeze" something. Unfortunately that either fact either went unnoticed by Apple's design department or they deliberately chose to ignore it in favor of visual aesthetics.
My wife didn't even know the reason why the position was changed in the first place, so it seems that the disadvantages (obvious) of the new placement outweigh the advantages (not so obvious).