Letting the manufacturer dictate "YOUR SOUND" is not my idea of being an arranger KB player. And this is why many sound well how can I put it "Canned" Putting your own tag on styles as Ian states in his post is spot on...Squeak is on the money also....I have never heard a arranger kb sound ready for the stage that came "Out of the Box"....
I personally take EVERY SINGLE STYLE & SMF and completely strip it down and rebuild it up to my standards Part By Part...with every editable feature I can find if necessary. This is why when I hear people say this sounds bad or that sounds weird....I know they haven't taken the time to DIG into te OS and make it sound the way you want....or maybe some people don't know how or are too lazy & dont care? Or may they think it sounds good until someone says something? Playing an arranger KB goes way beyond just turning it on and hitting a few sounds & styles which many do you are in command of a whole band & need to know how to orchestrate every single part as if the band was next to you on stage.
does it take time YES......is it fun....YES....is it worth it YES.....will they do it?... that's up to the individual who wants to sound great not just "Out of the Box" On top of this you need the play well also....& please SAVE everything you edit 3x or you'll be a very unhappy camper if you lose it all...All these KBs have the ability to tweak some better then others but in some way its in there...Go For It