While this would be nice, considering the servers can't seem to handle congestion very well, they would probably implode if zones like Sea of Clouds and The Ruby Sea were completely seamless when transitioning into areas like Foundation and Yanxia/The Azim Steppe.

1.0 had large, seemingly seamless areas. And while 1.0's issues were far deeper than large maps, it didn't work out. ARR's devs and Yoshi realize that, and they seem far too cautious to allow for this tbh.