I think we get a baseline (which multiple people have mentioned here) of nations that don't trust each other, don't necessarily get along, with shades of grey rather than black and white. That goes back to the wargaming roots of the hobby, and has pretty much been a thread throughout all editions of Greyhawk. Beyond that (okay, and the love of Darlene's map), I think it starts to break down. To some it's human-centric, while others see it as a traditional D&D panoply. But that baseline, as
@teitan mentioned, is a pretty meaty hook that easily crosses generations.
I agree on draconians != dragonborn. Tinker gnomes, gully dwarves, and kender should be present in Dragonlance, but there's no way around it - they need to be reworked to eliminate the problematic tropes inherent in them. I don't know that they're core to the Dragonlance experience, but they are part of it, certainly.
