Your example is technically not fiction, but as you point out, its main purpose is to enthrall the reader with a compelling story, not to convey a large amount

Your example is technically not fiction, but as you point out, its main purpose is to enthrall the reader with a compelling story, not to convey a large amount of dense information in the way that textbooks, manuals, and academic papers do. If a reader wanted to extract and retain as much information as possible from Endurance (say, if they were studying it in school, or read it but found they didn't retain a lot of the key points), they would still benefit from skimming, skipping around, taking notes, and other advice provided in this post. This advice applies to anyone who wishes to extract and retain information and understanding from any given piece of text, fiction or non. Just don't spoil compelling stories for yourself unless you really want to.