Also my sentiment. Good fictional storytelling describes the corners and in-betweens of human experience; non-fiction typically describes a mix of technical tools(basically trade skills and weaponizable knowledge) and self-promotion(the book was in some fashion written for a career purpose).

The exceptions abound, of course, but categorically speaking, you only need some technical knowledge. It's the "how to lead your life" knowledge that is harder to glean, and one most resistant to taking a head-on approach like studying all the philosophers and then ranking their greatness in a spreadsheet.