The "rubrics" posted yesterday probably stem from one underlying principle : Beauty is the substance/structure of poetry. A corollary of this is the notion Jonathan Mayhew was talking about recently : Taste is an impersonal response to an objective reality (beauty).
The strict measures of beauty - not political polemics & allegiances - are what drive the merchants of the "poetry market" from the temple.
One could just as well say that Taste is a personal response to a subjective reality, if one were Kant, I guess (I'm not very well-grounded in philosophy). (Maybe this is what Jordan was getting at in his comment to Jonathan the other day.) But I'm not Kant, and I'm going to assume, with Charles Peirce (I guess), that we apprehend, imperfectly, the real objective existence of certain things, which we name with universal terms (ie. universally applicable).
& now I'm way over my head.