It's like with any other medium, the first run through is for entertainment. For example I watched a veritasium video about quantum physics. Fascinating. But I couldn't explain anything because I didn't understand it. It takes several watch to actually understand the concepts.
> Christmas is devoted to reading books we all know perfectly well.
Ha, this seems counterfactual to how the americans (traveling around recently and I don’t remember seeing anyone with a book open).