As usual, you misunderstood My point.
I was not talking about the story, I was talking about the process that goes into deciding what the expansion continent will be. Blizzard doesn't follow any rule besides rule of cool, as evidenced by the decision to make Kul Tiras an expansion setting, but not Argus, Nazjatar, or Ny'alotha.
What's funny is that you even implicitly agreed with Me here, by acknowledging that they bend rules whenever they want (as for instance when they retconned WC3 just so that the Broken Isles could be a continent with 4 main races):
I am simply able to recognize the patterns, and see that there is no pattern at all besides rule of cool.