You're assuming every kid has access to a computer at his desk and at home.
I agree about the books, though. My daughter's backpack is way too heavy.
No, I recognized that (just didn't solve the problem). Keep the physical textbook at school if you want - I just don't want my kid to break his spine hauling it back and forth. And while I feel sorry for kids that don't have computers, I believe that they are ubiquitous enough in today's society that they are generally available to anyone who really wants one.