Sorry, but once again, a pretty poor analogy with the MotifXS, there...
There are PLENTY of user demos that demonstrate how good the XS is. Quite obviously, despite being a fairly complex beast, its' owners somehow manage to tame it (at least, SOME of them). And that, my friend, is the point (which you constantly ignore)... SOME XS users manage to make great music with the XS. But NONE of the MS users so far have managed to achieve this. In fact, you can take just about ANYTHING out there, and find quite excellent user produced music. Nothing, in my experience, has managed to stymie its' users needs as effectively as the MS has (if making good music IS your goal ). It appears quite unique.
Theoretically, you would THINK this 'open' stuff should make BETTER music than its' closed brethren. But, post all you want, talk all you want, argue all you want. You simply CANNOT argue with the utter dearth of user music that succeeds in living up to the 'potential'. They have had FOUR YEARS to achieve this, and, IMO, virtually no-one has succeeded. Everyone is either using these for playing VSTi's live, or they are sitting at home, virtually unused, while their owners go out and gig on more capable, more usable keyboards.
Before you make any more comparisons to other keyboards, go out and listen to the BEST that their users have managed. Then listen to the best that MS users have managed. And ask yourself 'is Dom DELIBERATELY only selling to people incapable of making good music?'
No, I am sorry, my friend. If no-one has got this beast tamed after four years of trying, it is pretty reasonable (more than reasonable, IMO) to say that it CAN'T be tamed. And, if you don't believe this, I suggest you go and BUY ONE, and prove us wrong (or right!) for yourself...
You are probably as tired as I am waiting for someone ELSE to do it...
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An arranger is just a tool. What matters is what you build with it..!