I did read your comment Diki and i accept that most high level musicians do not use arranger keyboards and are happy using whatever they are familiar with. But thats just the point. They are not familira with arrangers and have no idea of their flexibility and explosive creative potential. Most top level musicians simply have no idea what an arranger can do nor how they can used in a group or solo setting.Right now the yamaha XS is being touted as the best thing since sliced bread and the main functions that are being relied upon to set this instrument apart from other pro keyboards is the arranger/performance functions. And its like somebody just switched on a light bulb in the "pro" musician market place. Suddenly musicians are starting to see the creative possiblilities with preprogrammed grooves and licks that move where you move musically .
Most musicians will have heard of Jordan Rudess and would rate him as being a phenominal keyboard player and yet they marvel at how he uses the Oasys Keyboard to such great effect. He programmes the keyboard including when and how to trigger samples loops etc within his live performances , saving and recalling performance registrations triggering loops via dedicated pads and so on. Sounds familiar doesnt it ? These are the EXACT SAME principles used in great arranger style performances.

The thing that stops great musicians from using arrangers is ignorance to the greatest extent , snobbery to a similarly great extent and for top end musicians, the availability of other great gigging musicians as in the clip i posted.