The arranger is on its way out (It will soon just be a niche market like the organ that the easy play arranger came from) and Yamaha know this, so they bring out a top notch arranger (So as to keep the current old fogies happy) and add workstation features to entice a younger audience, however, it is just a first step in what will take a number of years.

Everything evolves around apps these days (Hence Yamaha started adding them a few years ago) rather than inbuilt (Just look at modern TVs, they are flexible because they run 3rd party apps, not because of features inbuilt) so putting things out on apps that will work on the Genos (For those that want them) is the most logical thing to do. (Particularly if you are going after a younger market)

Bill