Earlier quoted context omitted.
In fairness, modern mobile devices seem to be determined to make how the filesystem works as opaque as possible.
Files and folders are based on a metaphor applying to paper-based organizational systems. People used to have typewriter printouts that they used to mark up by pen and place into folders, then file away into filing cabinets. Is there really a need for a filesystem other than in the vestiges of what we consider an operating system?
The "files and folders" metaphor never worked even in the heyday of computer literacy, most people never understood it and just dumped all their crap on the desktop.
Seeing as the metaphor did not, does not, and will not work it is only reasonable that personal computing is slowly moving away from it and towards something the users actually want: One singular place to store everything (and I mean everything) and a one-stop quick way to find something in there, organization be damned.
Email is perhaps one of the earliest manifestations of this user desire: Everything goes in the one singular Inbox, and you search for whatever mail you need.