Yamaha have yet to port their SA voice technology to even their top-of-the-line workstation series. I would be surprised (but pleased) to see it trickle down to their mid-line arrangers first.....
The truth is, the triggering concept for the legato/staccato ability of SA voices has been around since the Hammond B3, with the use of polyphonic single trigger voices in the 'percussion' section. It has taken decades for synth manufacturers to realize the value of being able to phrase a line without being limited to monophonic synth sounds.
One can only hope that this is the start of a whole new direction of sound generation, one that finally allows sampled sounds some of the flexibility that real instruments have.....
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An arranger is just a tool. What matters is what you build with it..!