That is the problem: they are digesting it. They are not creating a new kind of library, where you could say, show me the text of "How to Fix Your Ice Cream Problems". (An actual book I own) It is not being done for our future reference.
This is a grave problem.
> you will (if the model is good) be able to get the knowledge out of it
That doesn't help with books that aren't factual in nature. "Getting the knowledge" out of a novel makes no sense.