The problem with having an open system added to a closed one is that you will run in to the laws of diminishing returns.

If you have a keyboard with perfect sounds, perfects styles and loops preloaded, what would be the benefit of having the open component of that keyboard when you are saying that persons are incapable of using open systems?

If I am spending a lot of money on a keyboard to get perfect sounds and styles preloaded, why would I spend extra money to have an open system included on that keyboard that I am incapable of using?