Yes, it is certainly true that there is joy in reading books and the mind and body get a different feeling. And it is also true that hard cover books are better because I myself keep losing attention while reading an online copy, the main reason is the notification expectation. And the feeling I get while reading the online copy makes it impossible to actually finish the book. If I had read the hard cover book, I would have got the best feeling and maybe I would have finished the book by now. The habit of reading books is really one of the best things to do.