I'm sorry, but there I have to disagree with you. In live use, most arrangers, and especially the G70, completely blow any modern WS out of the water for ease of use, live.
Not in KORG land these days. For real-time controls the arranger functions have been merged with the workstations, and some of what the workstation could do has made its way into their arrangers. The lines that separate them in the KORG world are very blur right now. The PA2X engine is like a Triton Series engine with a 16 part COMBI mode actually in PROG mode. Pretty advanced stuff really.
It's almost like KORG Italy get every other system from KORG Inc handed to them except for the arranger functions. Even though that's not the case entirely.
James.