1. Emerald Dream/Nightmare should've been it's on entire expac.
2. Argus should've been it's own entire expac. It's a planet...
3. Nazjatar should be it's own entire expac. With Azshara as the main villain through the whole thing, on the box art, everywhere.
Just my opinion. I don't like Blizz shoe-horning landmasses of lore areas into a patch or minor story of an expac, when they could easily make an entire expac around these area.