I agree that files aren't sacred, they are just another abstraction at the end of the day, but what the other user (I think) is referring to is the trend in which, as smartphone use becomes ubiquitous, users lose sight of the technical side of things.

It's not that the average user is ignorant of the many ways in which data can be stored and retrieved. It's that they are becoming ignorant of such abstractions existing altogether. It's hard to start thinking about how images are stored if all the user knows is "they are in the gallery".