I think it’s sad if the only narrative they can think of to make the hero class important to the narrative is “the villain made them”
It was a compelling hook, the first time
The second time, TBF, Illidan was less an antagonist at this point and more an anti-hero rallying others to his cause.
The third time, not only did they do “The villain made them” Story again, but they also did the “They were in stasis this whole time” just like the DH.
One of those they could have done without, like making Tyr or a Titan responsible for their creation.
At least that would have been a “hey the guys responsible for making the bad guy also made you”
Heck, they could have made the Dracthyr backstory more of an unexpected miracle that no one understood - and after failing to control them they were sealed away.
While Aberrus is where Neltharion experimented on Dracthyr to try to understand them, and even tried to replicate them. Hence the abominations.
Spitballing, but I think that leaves a whole lot more room for interesting and diverse characters amongst Dracthyr than simply “We were made in a lab to be soldiers and that’s all we knew till now.”
Which is a backstory that does not really capture the fantasy of playing a dragon, or feel fantastical at all really