I can't stop referring to the irony that the gist of "the 4-hour work week" is to write a book about working only 4 hours a week.

But also pretty much all of the self-help books I've read can be summarized in a few paragraphs, that is, a blog post. The rest is repetition or examples. Which are important for learning and understanding, I suppose, but when an AI can both tell you the gist of it while applying it directly to your current situation, they can't compete.