Jonathan likes to cogitate upon the conundrum of literary schools & conventions. & I'll grant that in every time period forms of writing reproduce a kind of basic introductory Acceptable Style, and an established Constellation of Authoritative Authors who are the acknowledged Prestigious Ones.
But what does it mean to say this, or criticize the situation? Not much. If you don't specify the particular Snipe - if you don't investigate & evaluate specific works of art - you're not doing a critical job of work.
Here's a popular Double-Yr-Money Shell Game which you can watch on the streets of New York:
The Gamester displays 3 shells :
1. Official Verse Culture
2. Rebel Verse Culture
3. Border Verse Culture (oscillating between #1 & 2)
The penny or nugget is Poetic Value, which the gamester/rhetorician shifts rapidly from one shell to the other.
The Gamester can play this game for hours, without ever applying Poetic Value judgements to a single work of art. We're playing it right now!!!