I received two responses of people who actually produced something.
The vast majority, it seems, are professional note-taking junkies.
People in the Obsidian forum spend their lives fooling around with metadata conventions and "tagging" and "wikilinks" instead of producing work that actually matters.
Intellectual procrastination at its finest.
Now we have this... ODIN—a way to outsource your intellectual note-taking procrastination to AI.
Note: The requirement wasn't just a book. It was any "published knowledge product" which I define as book, code, course, essay, etc. (What Naval Ravikant calls Specific Knowledge).