You've got to admit... to probably most of his audience (most likely not a crowd of arranger players!), they probably take home a MUCH greater impression of his act for being surrounded by keyboards on all sides, twisting and turning to play them all.
Now, WE know he could have done the exact same arrangement on just ONE of those keyboards, but you can bet your life it wouldn't have impressed the audience as much. Sometimes, humping in that extra gear has it's uses...
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An arranger is just a tool. What matters is what you build with it..!