One can only hope and pray that the new SA2 voices have the same attention to detail and playability as the old T2 voices. Because, for whatever reason, Yamaha's use of the SA voices on the MotifXS series has NOT been as resounding a success as the T2 implementation, and many MotifXS users are screaming for the same SA programming as the T2, which apparently does a LOT more for the player in the background, rather than leaving it up to switches and foot SWs to trigger the SA elements...
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An arranger is just a tool. What matters is what you build with it..!