Great analysis. I didn’t know Boxes and Arrows still published.
Remember the constructed emotions theory: Emotions are learned, not born. Different people therefore have different emotions; cultural environment influences these emotions. As video content becomes more dominant in our daily life, it becomes more influential on how we develop our emotions. As the content offering becomes more varied, the differences in emotion sets for the same geography becomes wider.
The change in the distribution of mass content has brought a change in global subcultural groups and thus in the global system of emotions.
My suggestion is that to have better prediction of viewer datasets, recommendation-based companies should involve the users in the tagging process of content. Don’t build a team of content taggers or analyzers: Ask your viewers to define the content. As is often the case in technology, the old way—in which people define rather then experts and algorithms)—is the more advanced.