Real books are organized into paragraphs (that help you understand connected ideas). In the new version of LingQ, i have noticed that it is a bit of an annoyance to have to switch pages to re-read parts of a SINGLE paragraph-- this is not a problem with the classic LingQ.
If the real/physical book I am currently reading (La Confession by John Grisham) forced me to turn the page every few sentences it would be thousands of pages long (instead of the 700+ pages it really is).