I think it is fine to pursue this ever increasingly detailed classification of things (not only in art or pop culture, this applies to other knowledge too, including science). The problem might come if one takes one of these descriptive, post-hoc classifications, ignores the fact that they are often diffuse and imperfect, and then tries to use it as a predictive model to explain and deal with everything, and discard any data that doesn't fit. But people like meta, so it might not even be a problem :)