The discussion revealed that people don't learn in shool how to read and study with books anymore. Of course you don't remember much if you read the book from start to end. E-readers may share the blame. It's very hard and slow to study with e-book. If you spend hours studyin, you really need a book written into a paper.
Maybe one day computers and digital readers will actually be good enough to replace books. They're not even close today. The tech's just great.
For example, I use Foxit for looking at PDFs. Maddeningly, I cannot view two PDFs at the same time in different windows. There is no technical reason for this limitation, in fact, the limitation was deliberately programmed into it.
I'm pretty sure the people who program PDF readers have never actually used them. (There are a number of bizarre and trivial limitations to them that are trivially fixed. For example, many readers can only remember the last page read for the most recently read PDF. So if you open another PDF, your earlier place vanishes.)
Another advantage for me of physical books (etc) is that you have something like "tactile memory." What I mean by this is that very often, I can find where something was mentioned basically by how the book feels when its opened (e.g., how thick the pages are in each hand). A similar thing happens with shelves of books.
This is pretty hard to replicate with better tech.
I use a (reasonably good) Android reader which affords metadata presentation and editing, but lacks an "author" field.
Long since reported. Not fixed.
I remember on PDF reader on a tablet which would remember your last read position only in the last 3 PDFs you opened. Open another one, and one gets pushed off the bed. I simply cannot understand the train of thought that concluded that 3 was the lucky number here.
What I fear may go away is the long form books offer. When exploring a new topic, articles are often too dense. In books, authors can establish the background, help create a shared vocabulary, and motivate what is often so condensed in a research article.