Twitch.
The author's clearly been interacting with different people from the ones I know. 80-somethings who didn't grow up with computers frequently get hopelessly confused by directories. The philosophy professor who's been using a Mac since the mid-80s is a bit harder to explain. And then there was the time I got called in in the early 90s to fix the office PC used by a succession of secretaries -- running MS-DOS -- and discovered they'd saved something over 2000 Word Perfect files in the root directory because none of the temps the company had employed over a 12 month period had ever heard of directories.
In my experience many casual users (for values of something like 10%-50% of computer users these days) simply do not "get" hierarchical storage at all; they find it as baffling as predicate calculus. Hence the desire of some software vendors -- who are trying to provide machines that anyone can use without training -- to move away from it, at least on the user's side.