Because we've come to take printed books for granted, we tend to overlook their enormous flexibility as reading instruments. It's easy to flip through the pages of a physical book, forward and backward. It's easy to jump quickly between widely separated sections, marking your place with your thumb or a stray bit of paper or even a hair plucked from your head (yes, I believe I've done that). You can write anywhere and in any form on any page of a book, using pen or pencil or highlighter or the tip of a burnt match (ditto). You can dog-ear pages or fold them in half or rip them out. You can keep many different books open simultaneously, dipping in and out of them to gather related information. And when you just want to read, the tranquility of a printed book provides a natural shield against distraction. Despite being low-tech - or maybe because of it - printed books and other paper documents support all sorts of reading techniques, they make it easy to shift seamlessly between those techniques, and they're amenable to personal idiosyncrasies and eccentricities.
E-books are much more rigid. Refreshing discrete pages of text on a fixed screen is a far different, and far less flexible, process than flipping through pliant pages of fixed text. By necessity, a screen-based, software-powered reading device imposes navigational protocols and routines on the user, allowing certain patterns of use but preventing or hindering others. All sorts of modes of navigation and reading that are easy with printed books become more difficult with electronic books - and even a small degree of added difficulty will quickly frustrate a reader. Whereas a printed book adapts readily to whoever is holding it, an e-book requires the reader to adapt to it.
Follow this link for the full article by Megan McArdle.