The technology is evolving in that way, sort of. We have tools for content analysis and one of such analysis is text summarization. It would be extremely useful

The technology is evolving in that way, sort of. We have tools for content analysis and one of such analysis is text summarization. It would be extremely useful if text summarizators would become developed enough to be of any practical use. To be able to easily create a summary for the entire book, then if you're interested - for the individual chapters, and so on, each time in various volume/detail according to your time constraint and degree of interest. Pretty much like a zoom function you do on a very high resolution image.