I have no idea why every Roland that comes out adds one great feature and drops three. About the only explanation that makes sense is that they have no continuity in their arranger development teams. Perhaps Roland clear house after each series, and start with a new team, that may have little clue about what made the previous one so good, and their own agenda about features they want to include..?

It's either that, or they send all their rejects from every other division, every screw-up they can find in house, and banish them to Purgatory in the arranger division!

That would explain this, too!