I find having a generated cover in the GUI very useful, I use one of nine pictures to provide a visual cue as to the 'books' overall subject, also the Title and Author are visible at a glance.
I don't want the cover in the book, because in that context they serve no practical or aesthetic purpose - in other words they're a waste of space. Some folks are OCD about having the right/best cover, I guess I'm OCD about having no cover
BR