I didn’t say that iOS is some different breed of computer, I said that it doesn’t present a lot of the complexity. Of course it’s all files underneath but the point is that they are usually presented in a way that doesn’t leave the user thinking of them as “files” as an abstract concept. People browsing through the Photos app aren’t really thinking about file names, whether it’s a JPEG or some other format, what folders they’re in etc. The “abstraction” doesn’t need to be deep to be effective.