-It isnt jungle as the oh-so-precious Morrowind said, its is comprised of geographical regions that differ across the province and their location. Eg, Swamp near Black Marsh, rocky highlands near Hammerfell. (Bethesda didnt want the whole place Jungle, so they changed it, live with it)
The jungle was only important as a cradle for Nibenean culture. But that got axed, so the jungle is no longer important.
-Architecture is influenced by the varying demographic and cultural patterns across the province. Eg, Bruma is heavily influenced by its large Nord population, which Cheydinhal has a tudor-sort of style similar to the Imperial towns in Vvardenfell, which isnt surprising considering the Dunmer in Cheydinhal could be considered Impeiral-style Dunmer)
You are justifying it well, but you are justifying bad decisions and mediocre execution.
-Magic in Cyrodiil is a far more restricted business than Morrowind, with the Mages Guild holding the monopoly on Spellcrafting/Enchanting in the province
See above. Boring.
-The Imperial Guard in Cyrodiil is recruited entirely Imperial, as the Ordinators are entirely Dunmer.
Which would be an interesting dynamic, if they actually acknowledged and justified the disparity, instead of pretending that these guys are the real thing, and not a ceremonial home guard drawn from an equestrian class. There, I improved Oblivion's lore in a single sentence.
-History of the Nedic Uprising against the Alyeid, and the roles of individuals such as Alessia and Pelinal Whitestrake.
Written entirely by an ex-dev they outsourced the creativity to, in fact the one who masterminded the Vvardenfell that unnerves Fable fans so much.
-Ayleid culture/architecture and its influence on the Empire.
You mean a dungeon tileset and an Indiana Jones quest?
-Info on the Amulet of Kings and the role of White-Gold
Once again, outsourced creativity by a contract writer and UTTERLY ignored by the main quest and the game as a whole, relying on unofficial lore to make sense of it all.