The thing is, until Yamaha raise the bar even higher with a T3, and newer, better capabilities, raising the bar TOO high on their mid-line arrangers is only going to scavenge sales of their TOTL arranger... Not something I think they want to do.

Wait until there's a T3, and I guarantee the NEXT mid-line PSR will be closer to T2 capabilities.
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An arranger is just a tool. What matters is what you build with it..!