thats exactly my idea....

A closed arranger system that takes care of styles and songs,

But with the option to use Vst's as solo instruments...(with an interface on the keyboard...but running on a remote PC system)

I think in that way you can catch the best of 2 worlds...........

Next to that i think the top model arranger should have all options available to a workstation. Including the controllers like sliders some potmeters/knobs and Pads and such.