I call d.6B useless because its reward is pretty low, and its risk is high, because you have to be in drive to pull it off. Hell if you are far enough away from your opponent I can't imagine you can even get a combo off.
I guess "eternally Useless" was a bad way to phrase it, maybe more like "situationally useless", I guess I might have to start using j.D in blockstrings to learn to appreciate d.6B more?