all those features you listed are immensely useful and enrich the way we access technical documentation, to the point of often outweigh the losses. That said, I do dream of a future when one could have a searchable book you can talk to but also use your hands in a natural way to flip trough the pages, hold your place with fingers etc. Our current touch screen gestures only scratch at the surface of what our hands can do, by focusing only on what you can do with the tips of the fingers.