Yes I agree with James here.
If the MS could have offered the "accepted standard" operations of an arranger - slash chord recognition, jazz chord recognition - break fills - then I certainly would have kept mine.
I would have then taken the time to fully learn the Q-ranger system and created my own audio styles. As it happened it did not, so I pursued the options of 3rd party arranger engines. And as I have described a few times in this place, THAT was a total waste of time money and energy!!
If indeed, these core (as I would consider them) functions of arranger are added to ANY future operating system, I would definitely re-purchase the MS, not in the keyboard form, as I am happy with my PA2xPro, but certainly the rack version.

IF, Domenico ever gets it finished and fully operational

Indeed, I still have ALL my MS instruments, Giga files and other data safely stored away, JUST in case that day ever happens

As I have stated many MANY times before, the W/S aspects of the MS are brilliant, and I DO miss the rest of this wonderful musical instrument.
I do NOT miss the arranger!!
Dennis