In my opinion where Yamaha arrangers fall short is that the overall sound lacks "guts" and "punch"... its a "soft" sound that just cant be "fixed" in anyway. It may work for other genres such as acoustic, easy listening unplugged type music, but for EDM its not good enough no matter how you look at it - all I can assume is that the samples them selves are compressed and stripped of their quality to shave off the amount of data and computing power required in PSR and Tyros/Genos keyboards... and all this becomes very much more evident when you turn off the insert effect and also route the sound through a decent PA system or monitoring speakers/headphones (not the speakers that come with the keyboards).
Where Yamaha falls short as above - Korg shines. overall it has that punch, that clarity, that overall "oomf" that is required in the sound, BUT... sadly it does lack the overall variety of content that you get in the yamaha for EDM... The PA4X doesn't have enough of the modernly used samples such as Hooks, stabs, plucks, leads, pumping pads etc- where yamaha have nailed it.
I agree with this. In amongst the variety & quantity of EDM / Dance & Disco type styles on Yamaha's boards, it doesn't make up the fact that they sound artificial to me, and I still think it's mainly in the drums though I think the blandness of only having 4 bar'd styles, bass line seem basic & repetitive compared to Korg & Ketron. Even with how much Yamaha have improved in the drums, to my ears they still sound unrealistic, unnatural & plastic sounding when comparing them to others. I didn't really notice this as much until I started to own and use more than one brand. The Yamaha's do have some fantastic sounds and I think that's where Yamaha's strength has always been.