OH, Donny, Donny ..... let Scott have his moment, will ya?
Just being honest Dave

....now if Jon Lord stopped by to play a T4 I'd might get excited
Or if Tony Monaco sat down and played the S910, using the incredibly good SA Jazz Rotary patch.

I do understand Scott's excitement, and yes, it does, to me, legitimize arranger use a little more...Lord (not Jon) knows, we've been often regarded as "not really playing" by the so-called "real deals" out there.
Thing is, I'm an experienced piano/organ/synth player with many years in bands and as a soloist...it takes a lot of work, time and just plain old creativity to make an arranger sound nice and "live" instead of boom-ticky-ticky-boom-ticky-ticky...just as much as it does doing a creative performance on piano, organ or synthesizer.
The arranger is just another "tool" in the modern (some would say, "hip") keyboardist's toolbox...that's all it is.
Ian