I miss the time when there was no "Tips.app" nor a need for such an app. Nearly every UI feature used to be discoverable and made sense. Those that didn't (like gestures to close apps on iPad) were gated by a toggle in Settings so that casual users who don't know/need it don't accidentally trigger it.

Last year I got an iPad, my first Apple device (I needed ForeFlight for flying, and it's only available for iPad). I downloaded a few manuals for ForeFlight, which apparently went to Books. I pulled one up in Books, spent a few minutes glancing and things, and spent the next 15 minutes trying to figure out how to get out of the current book back to my list of books. Finally took it to my wife (a long-time Apple fan), and it took her about 3 minutes of tapping and dragging various places. In the end, neither of us knew how we did it.

It's not a surprise to me that there's a manual and that it's even on the device :). But it seems like an iOS design pattern to keep this stuff hidden. I think it's okay for things that rarely happen by accident (multi-finger swipes or so), but touching (swiping?) over screen edges is something I seem to do often, so it becomes a problem. And I'm a geek in my early thirties, so it's not only a problem for the elderly!