You're arguing in favor of a product tour. iOS usability is garbage. There are no affordances. Nothing is discoverable. There are a million inputs (mostly gestures) that no one ever finds out about unless someone tells them or they Google it, and they're not consistent across apps, even first-party apps. Sometimes "swipe the row left" means "remove," sometimes it means "more actions". It's just a jumble of inconsistent nonsense.
Watch a non-tech person use their iPhone. They have no idea that they can do 50% of the things that they can do. Ever see anyone use "shake to undo" for example?