Yamaha's approach to "upgrade" isn't through new features added to the OS when it comes to their top arrangers. It has been clear over the years that their concept of upgrading in terms of OS is by purchasing the new model. If they gave you all those OS updates and feature additions who would buy the newest model.

It sucks that they're this way because they sure as hell don't do this for their pro synths (at least over the more recent years). Roland released the G.., then Yamaha releases an OS update to ADD features to the XS that compare to the Fantom G. Yamaha knows the uproar they'd get from customers in the pro synth area if they did the same thing to them as they do with the pro arranger owners.