That's the thing, Korgies, for the most part, like to delve a bit deeper. That's not to say that SOME Yamaha players don't get into that end of things, but it's not their typical arranger crowd. Their chosen axes fall well short of Korg when it comes to editing, that's no news to anyone. It's well known that most Yamaha arranger folks are just content to sit there and noodle out the old tried and true chestnuts and that's precisely the market that Yamaha goes after - all power to them.
Ever hear the term 'horses for courses'?