There are some things Missing from iOS which I just don't understand. Why can't we have a button to close all tabs in Safari? Why can't we arrange our home screen with spaces? Why can't we Set a different default browser? Why can't we Reply more easily two messages without having to go through an entire home screen transition? I feel there are some very easy fixes for usability that Apple continues to ignore or overlook- what else is missing that you think should be added?