They might want to transfer (a better word: share) photos/videos, documents, etc. And for those they use specific apps and "the cloud". No "files" (for the sake of files), and barely any hierarchy of (folders etc).
As long as the entity they want to share magically shows up on the another device or at the other person they want to share with, they are happy. They just skip two levels of abstraction ("this photo is a FILE and I will use USB to transfer it"). Maybe a far fetched analogy but this is why most of the drivers of an automatic don't really think about clutches and how the torque of the engine's output is converted.
At least this is my perception (outside the IT bubble)