As I mentioned before, I work with teenagers in school part time. There's practically zero interest in arrangers and it's hard to generate much interest. If the teens I'm around get interested in keys it's mostly synths and pianos.
Hard for me to imagine that Yamaha's music division loses much sleep over whether or not a new arranger is produced on a regular basis.
Different places different needs....
Just show those kids how to make EDM or hiphop with an arranger and you have their interest..
Play them a waltz or foxtrot and the interest is for ever gone
The reason arrangers dont grasp younger people is their content that is aimed at 70 + people..
Most people owning arrangers have no clue how to make 2017's edm hiphop and rap music... same goes for people selling these arrangers... but go and talk to Joe H at the psr tutorial forums. He will teel you how great these instruments are for creating such music, with the new features the 790 is even more formidable then the tyros..