You're stating what you believe Blizzard's intentions were when creating those classes. Blizzard NEVER stated that when you roll a DK or a DH you're going to be fulfilling the fantasy of playing as Illidan or the Lich King. However, they have stated repeatedly that the Dracthyr fulfills the fantasy of playing as a dragon.
We should also recognize that you're playing as a creature here. When Druids turn into beasts, they're actually beasts. Death Knights allow you to be undead and Demon Hunters allow you to be a demon. Shaman allow you to (briefly) play as an elemental. If we had a Tinker class and it allowed you to transform into a robot, you would be a mechanical.
It's quite odd that some here can't accept that Blizzard is now allowing you to be a playable dragon.
Yeah, Blizzard didn't say that. They said that Neltharian merged the essence of dragons with the adaptability of mortals. They never said that he physically took mortals and merged them with dragons.Nah blizzard said that they’re mortals infused with the essences of dragons which is the backstory behind the Drakonids that we’ve seen.
Both were created to be soldiers for the dragonflights.
Link?Both have mortal visage forms.
Both can call upon/use magic from the dragonflights, even chromatic drakonids exist that can use all dragonflights magics like the Dracthyr.
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I believe the problem with that is it would be too close to Demon Hunters.
In addition, the main selling point of the DE is playing as a dragon. I don't believe most players want to be a glorified mage. They would rather be a dragon flying around and raining down fire with dragon flame.