I'm going to disagree with my learned friend, Donny. Those onboard and third party arranger styles are fantastic features that provide OMB entertainers with the fullness of an entire band, which I guess is why arranger keyboards were created to begin with. The old way is just fine, but the bass, drums, and other layered voices do so much for a song, and yet they still allow you to be creative. That's why I'm working every day of the week and nearly all the piano and organ players I know that did not switch to an arranger are sitting in the audiences and not working. That's why we need drums, Donny.
All the best,
Gary

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K+E=W (Knowledge Plus Experience = Wisdom.)