Ian,
It may be some mis-information.
Change for us humans is difficult sometimes.
Some that are used to , lets say a Yamaha UI, may at first be lost on a Korg PA.
If they READ the manual, watch the tutorials etc...and give it time, they will love it more times than not.

Also, this issue of lack of styles...well there is lots of styles, no not as many as Yamaha, but lots. And the styles are great.
More of them are general use not song specific.
BUT the tools for style creation/editing are superb. Rikki, as example loves the tools, and has dome a lot of style work.

Also, the issue of not enough fills is over stated. Yes, it would be better/nice f there were more. But, the GREAT PAD functions more than make up for it. They are like a fill you can copy fron style parts or make entirely yoursef and it's easy.
In no way does these comments mean the PA is perfect...none are.

Lee S.