I'd say it's because it's a PRO vs Home Organ Player scenario.......where real pro's don't want to be associated with an automatic arranger kb vs a synth workstation stigma....thats why you never see an arranger kb on pro music stage acts all over the world,........you only see Motif, Nord, Fantom, etc, etc,....keeping two separate divisions & more choices = more money for the manufacturers. It's like cigarettes & "light" cigarettes, or salad dressing & "lite" dressing its all in the mind......all they care about is making money. Putting the two together alienates the masses,..although it would be nice why buy one when you have buy two to do the jobs...