Reminds me of the time I was working on a project that involved combining several interrelated narratives about individuals. My collaborator at one point said, "I've worked out the common thread between all our characters' stories: they all have something they want, and they are all trying to get it."
It was a couple of moments before we both realised the absurdity of that, because it basically applies to every protagonist ever.
Such books are nice and can provide insights, but with the amount of digital data available and the recent advances in NLP, I think it's time for a more data-driven approach to "taxonomizing plot"