I think for 88 and 76 note players, there's a reason why pianos have benches, not stools....
You need to be able to move laterally for two hand passages at the extremes of the keyboard. I never feel comfortable on a drum throne type seat that rotates, but I can't budge sideways. It makes you put your arms and wrists at some uncomfortable angles...
(Disclaimer... Not all people may share this view, there's no problem if you are comfortable using drum thrones, objects in mirror may be closer than they appear, your mileage may vary.... OK?)
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An arranger is just a tool. What matters is what you build with it..!