So let us talk about Shadowlands map design. Can someone tell me what is so bad about the zones not being physically connected? No one I've read talk about it seems to provide a reason other than "It's different from what I'm used to and therefore bad." I genuinely do not see what the big deal is. I did not see a problem in Cata and I don't see one now for Shadowlands. In TBC, Cata, WoD, Legion, and BFA zones have been pretty much completely independent from one another in both design and story.
Since The Burning Crusade expansion Blizzard has created zones to have had such contained stories that do not spill over into other zones and such distinct designed from one another that they might as well be disconnected. WotLK and MoP did a pretty good job at spilling over into other zones with the story, and it was kind of cool, but even in those Blizzard has shown their best work at creating a zone-contained story with a few key characters moving on to the next zone with you. While those two expansions may have been Blizzard's most successful, I would not attribute it to this element, but rather the mechanics and gameplay design of the game in place at those times.
Since as long as I can recall in playing this game moving through the mountain/river border of two zones might as well have them be on separate continents. More often than not the designs and storylines of two adjacent zones look like they shouldn't be sitting anywhere near each other. With Shadowlands I think borrowing from Final Fantasy 14's idea of instancing each zone separately can improve on load times and allow Blizzard to go all out with their visual designs without having to worry about what you can see in the distance.