Quoting word for word, they said that they wanted to create a "draconic humanoid" race. That doesn't imply that their goal with Dracthyr was to represent old draconic races as much as possible, so no, they didn't fail on that, because they never promised that. They promised a "draconic humanoid" and Dracthyr is a draconic humanoid. That it doesn't look the want you want it to look is not a failure on their part, because they never meant to deliver what you want. Therefore, Dracthyr is not a "wasted potential" for something it was never meant to be.