[Nate the great]

Originally Posted by kindlekitten

yeah, but we don't need extra reading devices (glasses, goggles, lenses, what have you) for all those formats

Actually, I would say that the parallel is between screen geometry (of an ebook reader) and book dimensions. Most of the book types I listed have different dimensions. I think they would each benefit from an appropriate screen size. At the very least, comics look best on a large color screen, and you don't need color for most other fiction.