But it is my PLAYING that is triggering those electronic events!!! ... if I turn on my Pa900, as 'SMART' as it is, it is as dumb as a rock ... it does NOTHING on its own ... even if I select a style and hit play, nothing changes unless I change it !!!... and how good it sounds is up to me and my imagination - as others have said or implied here - and how I use those "ELECTRONIC EVENTS" ...
Now, am I going to satisfy every type of audience out there with my KB - NO!, but I'm not trying to either ...
Yes, and your choices might be different than what another arranger player may use, and your music will have it's own stamp on it.
Also, Tony, we have to remember we are there to please the "common ear", not put on a virtuoso performance that would bring the house down, although if we can manage that, all the better.

It's not a competition.
Plus, you may decide to play different inversions of the regular chords, or even add some of your own to further personalize your tune.
To look at it another way, a guitarist forms the chords with one hand and plays the notes with the other, which is what we do when using a style...is it any less professional, especially if we are using a complimentary sound to the left of the split?
The scarcity of pro arranger players in my area worked to my advantage, and myself and another arranger player pretty much got a lot of jobs because of it.
Also, if we've had experience on Rhodes or Hammond, we can apply that knowledge to the relevant sounds on our arranger, for as you know, proper voicing (just one example) is critical on these instruments as opposed to an acoustic piano for instance.
We are lucky to be at a point in time where these instruments are so powerful and yet still easy to work with.
Ian