1. That is why reading is the king. You just reread. If you do not reread, you do not have a story.

2. Definitely not. I know one of such book, I use to reread it once per every few months. Year after year I keep finding new insights.

3. Going back or forth is stupidly realised on any music player except vinyl and maybe casette, that's why you might consider to keep listening. Normally after missing a few words, the text became glibberish, but typical news or Youtube content may be keep listening without losing the context even at higher speed.

200 pages per 5h is not slow if you are reading OReilly even on your mother language.