Instead of floating islands, each Shadowlands zone should have an infinite horizon.
Yes, there is a fixed playable game area, but on the borders of that area instead show the zones stretching out into the horizon forever. It could all be a painted background like the cityscape skybox on Argus - Mac’Aree, or it could be an image based on a procedurally generated landscape using game assets. It doesn’t matter. The point would be to add a sense of scale that each zone in the Shadowlands goes on forever… You just can’t access it because there’s a force field in the way.