One sort of meta-textual disagreement: IIRC, you’ve said that the flow of civilization from Essos to Westeros is meaningfully different from Earth, where stereotypically civilization has come out of the Mediterranean. (I’m no historian or anything like it, but I imagine you get what I’m saying). But isn’t it more likely that Westeros just is a stand-in for America, not England? GRRM is American, Essos feels like Europe, etc.

No. Westeros is England down to the bones. The First Men are the Celts, the Andals are the Anglo-Saxons, Aegon/William the Conqueror and his Valyrians are the Normans, King’s Landing = London, Red Keep = Tower of London, the Wall = Hadrian’s Wall, the Dance of the Dragons = the Anarchy, the Great Council = early Parliaments, War of Five Kings = Wars of the Roses, Starks = House of York, Lannisters = House of Lancaster, etc. I could go on for literally years, but all you need to do is look up GRRM’s public statements – he’s been very clear that his inspirations come chiefly out of Medieval English history. 

My meta-textual argument was that readers cannot assume the presumed political, economic, cultural, etc. hegemony of West over East in post-colonial theory, as that hegemony and its literary reflections are historically bounded in a process of imperialism and colonialism that took place gradually from the 15th through 19th centuries, and that process has not happened in Westeros. By contrast, Essos is the dominant political, cultural, economic, technological party, the one that has conquered and colonized parts of Westeros no less than four times – Westeros has never colonized Essos.