I think Moby Dick is a romance. I guess the term is confusing in English because people think “love story” but an older use of the word just means a novel with adventure, chivalric elements.
There is also a giant implicit “for me” in your preference. It just happens that your preference happens to be one that is mainstream. A lot of types of reading are not linear —- for instance, if you have to read to write a book report, you have to go back, make notes, flip back and forth. A straight through reading will not produce a good book report.
I read non-fiction and also great books (of the western canon) and in order to really read to understand, I need to flip back and forth and take notes and engage with the text. My reading instructor always tells me, “good reading is re-reading.” Single pass reading works for entertainment reading, but not for deep reading. (By deep reading, I mean the kind of reading that is taught in Mortimer Adler’s book referenced above)
For deep reading you have to interact with the text, most commonly by debating with it in the margins. This is pretty standard for academic reading (say when taking a humanities or literature class). It’s a pretty common use case that eReaders don’t support.