> With a CLI you have absolutely nothing.

I kindly disagree :-): I would say that with the CLI you have the exact equivalent: man pages.

Just like for a GUI you have to know that by hovering the cursor about an icon you will get some text description, with a CLI you have to know that there are man pages. And just like a bad GUI may have cryptic icons without any description text, a bad CLI will have no manpage. But we should compare a good GUI to a good CLI, to be fair.