I'd agree that Pandaria is one of the best continents we've gotten, but it's less about things like houses and more about cultures. They created a whole bunch of new races- Pandaren (technically existed before this but with almost no lore), Jinyu, Hozen, Mantid, Mogu, Yaungol, and Grummles- and almost all of them feel developed well, fit together well, and it all feels consistent. And they actually have a developed history together.
Compare to many other expansions since then, where most groups fit cleanly into their specific zone and barely mix. Did Dragonflight's Centaur and Tuskarr even interact once? Or in Legion, we had a thriving Druidic/Night Elven stronghold in Val'sharah that somehow had no contact with the Night Elven ghosts in Azsuna, and I think they didn't even notice that Suramar is still around right next to them? Or in Warlords, how much did the various Orc clans really interact beyond whatever conflicts happened in any given zone.
I'd say that Kul'tiras is probably the best continent we've gotten since then, if only because the various zones actually fit together to make a real society. Even Shadowlands is better than most post-Pandaria continents in this regard because it actually bothered to have the covenants interacting, which says a lot because it was infamously awful.
Hopefully future expansions handle that aspect better again. At least early leaks suggested that the Arathi visit the Earthen, so they should have some connection... and all the setup for the Arathi Empire seems solid. That alone already puts TWW's world-building above a lot of other expansions, but I'd need to see a lot more interactions to know if they did enough to actually make it good.