Don't bother stating the obvious, genesys... The complete lack of any facts at all just put this debate into the absurd... Ian's got nothing more than his faith in Yamaha, not a shred of evidence to back up his superior marketing knowledge (as if we haven't ALL worked in music retail at one time or another!). You'd think he'd have something more than platitudes... you know, like the odd verifiable fact. No such luck...
So, don't try to teach a pig to sing. You'll never succeed, and it just annoys the pig...
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An arranger is just a tool. What matters is what you build with it..!