I remember reading a few years ago from a teacher that was teaching a class that involved using the school computers, and a good amount of the kids seemingly didn't comprehend how to use a desktop OS with a windowing system. I can't remember the specifics but they seemed to only use it within the constraints of what they were used to from using smartphones and iPads. Like only using 1 app at a time in fullscreen, and didn't really understand dragging and dropping between different windows.