Agree in most of what said here, but Yamaha is "on the way" with something.
Revo drums sounds great at demoes, and it play with slight non repeatet differences that make it more human.
If they do similiar step with the bass, and manage to cut off some more of the "cold CD'ish soundpicture" stright out of the box, I really think they're shorten the live sound gap.
I think Genos are the best sounding arranger from Yamaha so far, at least in my ears.
But dynamic accomp is not any new invention, guess some of us still remember that Technics had this feature, and sadly dropped it again.