But many (if not most?) people do enjoy narrative -- they enjoy the build-up and suspense of what did Timothy Leary do that was so bad instead of getting straight to it, literary descriptions that paint a picture of a main character visually and personality-wise, and sentences that are natural and conversational (not a science article full of acronyms).
This is why I specifically mentioned the book is a combination of science and narrative -- which comes out of fiction. Born to Run is another classic example.
It's very rare that an author is excellent at clearly explaining science, excellent at writing narrative that hooks you, and also covers a topic that is very timely, widely unknown, and fascinating. That's the kind of triple-threat combination that makes it a best book for me.