But that gets us back to the "Theory is closer to practice in theory more than practice" problem. some type of recommendation engines works really well especia

But that gets us back to the "Theory is closer to practice in theory more than practice" problem. some type of recommendation engines works really well especially the collaborative filtering types. Exactly what I was asking about, because I'm not so sure. Furthermore, I think it's a category error to include collaborative filtering here, which is not automated/ML/etc.