This! I find the ingrained rush to get to T2 a just expected these days, when there are interesting stories that can be told even at Level 1. I always tell my groups we'll be taking a bit longer to level through T1 (although not excessively so!) to enjoy what those levels can offer.
Interesting. There's a random reference to a "Shou district" in Westgate on Page 182 (as the source of many of the members of the Nine Golden Swords crime syndicate. I don't think the Shou have been mentioned elsewhere at all in either book.
A "hobbit" makes an appearance the 1989 game Curse of the Azure Bonds, even though halfling characters are possible and there's an important halfling (named as such) earlier in the game.
All that's needed for Planescape is a follow-up Manual of the Planes type book, and at that point, coverage is pretty complete. It seems that the vast majority of people knew that there simply wouldn't be a way to do complete, full, in-depth coverage without a book that would need a wheelbarrow...
The various mentions of the various Mulan deities wasn't in any organized manner; it was much more off-handedly. Also Isis and Osiris weren't mentioned either, and they should have been. It was all very ad hoc.
We kind of need a sister thread to this one: "What areas should Adventures in Faerun II: Elminster Boogaloo cover in detail?"
I've often stated that Cormyr should have gotten in-depth coverage in this book, as well as Thay. Let's hope it does well enough that we can get a sequel covering...
The only mentions of anything outside of Faerun proper by name that I've found so far is a mention of the Hordelands. Granted, there's a lot of reading to be done.
As part of a suggested outline for a Dalelands campaign featuring Moander:
"Levels 17–20. Moander manifests as a Blob of Annihilation to enter Myth Drannor and feed on the ancient magic of the broken city, becoming even more powerful."
I mean, that was basically his plan in the novel, but I...