Reading through the example email given, and perhaps reading on mobile spurs this idea, summary structure had a lot of headings and bullet points, which makes for a really long list of a summary. Would it be possible to instead make it a mind map of concepts and cross reference related ideas, instead or as well as a one dimensional list?
Throwaway accounts since I don't have any info with me. I thought of something similar, but for news. Basically, a summary attempting to make everything as neutral as possible. I am not sure I would see a use case for a book -- but I am just a random person on the internet.