I'm not sure why is would be simpler... it's not like they name them "IMR .30-06".
I was not aware that certain powders were for certain cartridges, with a few exceptions.
What name would give to Win748? It works well in cartridges from .204Ruger to 7mm-08 and more.
It seems to me that almost all powders, both rifle and handgun, overlap in their effectiveness to such a degree that any "purpose" naming scheme would be totally impractical, if not impossible.
Still happily answering to the call-sign Peetza.
The problem, as you so eloquently put it, is choice.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.