[narag]

...such as not understanding how folders could exist inside of other folders

I find this bit apalling. Some users were confused by that. So what? Do you take away the concept of nesting directories altogether because beginners are confused? They didn't, but we've being suffering a sneaky war on treeview for twenty five years. Every version it's more difficult to tweak the file explorer back to 95, losing some features forever. Real state is consumed by ribbons, quick access, libraries, all kind of stuff that's hard to delete if at all possible.

Last annoyance (it's also the shell, but not exactly the FM) is the taskbar hover previews. If you make the mistake to let the mouse over some app icon in the taskbar, a pop-up window appears over your current window showing a preview of the iconized application. There used to be a hack to disable that crap, setting a high delay for the hover. They've removed that with an automated update.