It's not just that the physical experience of reading a physical book is different. When you want to have another look at something you read earlier in a book, it can be far easier to find it in a printed book, especially if what you remember about it is pretty vague and unspecific.

It,s the same with newspapers. If you want some story that was one the left hand page, and near some other story with a picture of a country scene, having even the best of indexes or search engine isn't likely to be much help.