I think this is a bad assessment. It depends a lot on the book. Text books, for example, are a lot easier to read in print than in ebook format. That's because it's easier to go back a page or two or look at two pages simultaneously. Also, one could easily go back and forth 100 pages in a second in a textbook, which is a lot harder with ebooks. Also, since ebooks can go on the internet, reading a paper textbook significantly limits the number of distractions.