Roland will have aftertouch if they ever make a TOTL arranger again.
Just like the S950, or the E-60, most MOTL arrangers don't have aftertouch enabled keybeds. Korg's the only one bucking this trend.
And if it has taken Yamaha over 10 YEARS to respond to what seems significant customer demand, perhaps having the most sales isn't necessarily the best thing..? It has made them complacent and unresponsive.
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An arranger is just a tool. What matters is what you build with it..!