Require Standard Navigation in Third-Party Apps
Navigating iOS within built-in apps is a breeze, everything is consistent. But open a third-party app and some of the expectations fly out the window. For example, in system apps you can swipe from the left side of the screen to move backward through menus; but, only some third-party apps choose to include this in their apps. Requiring developers to implement standard navigation practices across apps would be a huge win for the end-user.