Well said. Gestures are all good, until they become arbitrary and everywhere. My 1yo can navigate through the apps on my iPhone because the system's unexciting

Well said. Gestures are all good, until they become arbitrary and everywhere. My 1yo can navigate through the apps on my iPhone because the system's unexciting but intuitive use of buttons for the most important things: app icons are buttons, most things interesting to her are tappable, and mostly importantly, when something goes "wrong" - app showing ads, reaching an unrecognized page of SpringBoard - she could always push the only big physical button to get back and restart. Now that simplicity is another kind of coolness that we should really shoot for. (There are definitely arbitrary use of gestures in iOS, but they are mostly for non-essential tasks or to provide shortcuts. You could swipe an item in a table to reveal the delete button, but you almost always can find an "Edit" button to achieve the same goal.)