Well the Korg has only five things you can assign. The Yamaha, ten (plus whatever the pedal does), plus there are MORE switch inputs on it and breath controllers, whatever.
Now, for me, first and foremost I've got to have the four variations on the pedal (with Auto fill ON)... so with the Korg, that leaves ONE... And that one is needed for a boatload of functions..
How about Leslie fast/slow?
How about On bass on/off?
Haw about the break/fill?
How about the Piano/Standard mode?
To many choices for one pedal...
Heck even my FC-7 only has seven. I wish I could hook up two or three of them!
That FC10 is a hell of a good thing...
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An arranger is just a tool. What matters is what you build with it..!