Well, it's not just that (not that I disagree with the author in general, but I do on this point). point-and-click interfaces _are_ objectively worse interfaces for power use. I've been stuck selecting a group of files, moving them, double-clicking and renaming, selecting another, etc. all the while knowing that I could write a script that could do all of this much faster if I had access to a command line interface. Point-and-click is just easier to get started with.