Power users are people who take multiple software tools and play them like the conductor of an orchestra, crafting from them a powerful metatool with the combined features of all, often with gap fillers and automators, such as shell scripts, AppleScript, cron jobs, Apple Automation, etc.
They tend to apply dynamic subsets of this power tool to "projects", kept in "project folders", containing images downloaded with one tool, edited with another, graphics generated in a third, code edited in another, marketing docs written in yet another, data fetched by a script to be opened by a spreadsheet app, turned into a chart and combined with the marketing doc into a PDF-based presentation....
And Apple builds some hardware that would be great for adding powers to the metatool (quick, finger-drawn sketches turn into useful charts to be merged into some other doc with layout manipulated by hand...) but Apple's position is that their target customers are really far too...limited to be able to understand hard stuff like "folders" or how to even find their files after plugging a thumb drive into a USB port, so no folders, no USB, no confusing "orchestra", just sit back, poke an app button and buy something from one of our nice stores (you understand shopping, don't you? Poke the button), notice how thin it is, poke an app button and watch a nice video, notice what a nice shade of pink, uh, "rose gold" it is, poke an app button and distract yourself with FaceBook, express and opinion about a celebrity and, since we're always adding new ways to buy things, maybe treat yourself and buy something extra....
It has worked wonders for them financially, so I can't fault their logic (bemoan it, yes, but not fault it), but this is no equivalent of a power user OS with a real file system.