I just think they were responding to how well suited the Yamaha styles are for that 'senior' crowd... Korg always struck me as better contemporary styles, especially smooth jazz, and trip hop, acid jazz, sort of 'hip' styles (not 'broken hip' styles! ), but Yamaha have got that 'oldies' thing down cold....
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An arranger is just a tool. What matters is what you build with it..!