They were discoverable, though. It boiled down to "swipe up from the bottom to go home, swipe down from the top for settings", and at first start-up it forced y

They were discoverable, though. It boiled down to "swipe up from the bottom to go home, swipe down from the top for settings", and at first start-up it forced you to perform these two actions before setting you free. Swipe left to go back worked anywhere (you didn't have to start from the edge of the screen) and dynamically showed the page being pulled off the stack, so it was super discoverable. All of the swipe gestures worked this way—"peek" was core to the interaction model because it made users feel in control, and let them cancel an action by just dragging back to where they started. The two-finger swipe from top was only to bring the system quick settings while in an app (the two-finger gesture was also only added late in the OS's life, at the behest of power users); the quick settings were available on the home screen with a single swipe. While in an app, a single swipe brings up the app's settings. The only non-discoverable gesture was swiping the corner of the keyboard to dismiss it, and it was also totally useless. The advertised way to dismiss the keyboard was by long-pressing the space bar (there was an icon showing this).