Chas, back in the day, the bass KB (Moog) always sat on the Rhodes, so I guess I'm just used to it. Having a full range chords voice on bottom appeals to me for so many rubato passages, intros, endings etc, and the small reach up to the arranger controller is negligible, at best. Another reason for the hierarchy of elevation is that I don't like having buttons and screen hidden by the top KB. I like that bottom layer to be tucked in as close as possible under the top.
How different is it for a traditional B# setup where your right hand is almost always elevated? ... Things that make you go hmmmmm