Because that makes too much sense. Seems like a lot of things in the wonderful world of aviation don't make a whole lot of sense. Like, why are there NACO charts in the training world when airlines use Jeppesen? Isn't training for the airlines ultimately what it all comes down to? That's the whole reason I started using Jepps instead of NACO.

Other than that, I agree that everything should be one or the other, not both.