Typically these faster versions of books start to also achieve the volatility of brains, for reasons I will pursue at a later time. And finally, books, by themselves, have absolutely no capability to affect the world around them. The book might fall off a shelf, hit a candle, set fire to the house, and burn down the city, but that is a function of the book object not the knowledge in the book. For the knowledge in a book to be at all active, it must be transported into one of the other media. There is no reason why we could not keep software at least as long as we keep books, and possibly as long as we have kept tools.
Software is also quick to update maybe too quick to update, sometimes.
Software is mostly intentional, though there are a number of artifacts in software which are at least partially accidental. Again, more on this topic later. Finally, software has a great capability to affect the outside world. With the correct interfaces, software can control machines, guide ships, produce drugs, communicate over long distances, fly aeroplanes, balance your checkbook, and detonate an enormous bomb. These advantages explain why we are so busy transcribing the knowledge of mankind into this form.