I also noticed you made reference to Songstyles as evidence this isn't new, as well. Let me clear up the difference...

Yes, you can use style divisions as preset chord changes, but they are hardwired to the style. A chord sequencer is independent of the style, so one CS can drive as many different styles as you want. Creating songstyles by importing the SMF of that song's separate structure elements into different style divisions is a complex task, and you still end up with it in only one style. If you want a dozen different versions of the song in different styles, you have to repeat the work dozens of times. Best of luck!

With a CS, you do it ONCE.

The other primary difference between using a multi-part CS and a Songstyle is, you have to remember what each style division does, what part of the song Variation 4 is, or what part is triggered by Fill3, and whether you have to remember to loop it or play one time, etc.. There's no on screen guide... If you have dozens of songstyles (or hundreds!), that's dozens or more styles you have to carefully remember what each division does, and trigger it carefully, or it's a train-wreck..!

Yamaha's CS has names for each segment on screen. Yes, admittedly at the moment, the type font for each segment is harder to read than it could be, but it IS there... If enough Yamaha users made a stink at Yamaha, perhaps they might modify it so the main part of the display had the segment name rather than the chords (which doesn't make sense if you use the transpose unless you have them as I-IV-V type!).

In almost every way, Yamaha's eight part CS is easier to use than songstyles. The one win for the songstyle is that there are more divisions in a style than eight (3 Intros, 4 Variations, 4 fills, 4 outros and a break/fill). But, in fairness, most songs don't really have more than eight distinct sections (verse, chorus, bridge, solo etc.), and the ability to use the CS on any style you want instantly more than outweighs that, I think.

In truth, the songstyle is listening to its death knell, I think. The multi-part CS is superior in almost all respects...