I was planning to reply to your parent comment that discoverability has always been an issue for me when I work with Apple devices. Whenever I use my wife's iPhone or Mac for a couple of minutes, I get frustrated because everything is all over the place, none of the apps work well together, and everything is hidden.
Back on Android, (or Windows, or Linux), it makes sense, whereas she loses her way. Just to point out, a part of discoverability I guess is familiarity with the underlying principles the UI follows as well.
To add two more points to this. I think there's one thing platforms in general got very right: simple touch controls. My one year old is discovering that sliding fingers across a screen, touching and pinching (the three basics) does stuff. Hidden menus, press-and-hold, and so on is secondary. Second, icons are something which is wrong. You need to guess their initial meaning, and translate badly in conversations, like recently with my mom: "press the rectangle with four arrows pointing out of it" (fullscreen or whatever it was).
