There is no doubt that a talented and knowledgeable musician will sound better than a less talented musician if both are playing the same instrument. But, there is also no doubt that a given musician can sound much better on a modern arranger keyboard than he could otherwise have sounded on an older instrument or possibly a piano. It’s not that the piano sounds better . . . It’s the fact that he can have so many instruments in the background making the end result sound so much richer and full.

Bernie hit the nail on the head. There is a point of diminishing returns, though. More is not necessarily better. Enough is best.