Nice whataboutism. However, the difference is that as @Swnem stated, Shadowlands is the perfect expansion for a Necromancer and a Dark Ranger class because Shadowlands fits the theme of both classes. There hasn't been an expansion yet that is themed around technology or Goblins and Gnomes.
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I know what Wrathion is, and you're missing the point entirely. Nothing stops Blizzard from using that as a gameplay device in order to allow your character to be able to change into a dragon. Again, it's just a gameplay device with nothing but upsides and no downsides.