Organs focus on layering, arrangers focus on solo instruments, having a fantastic violin & trumpet (For example) sounds c**p when layered, however when voiced correctly (As they are in organs) you get a fantastic sound when layered.
As to automatics, as I have said many times, arranger auto systems are a complete waste of space when it comes to organ play. (This is why most organists have them turned off or simplify them before playing, something you do not have to do if you use styles designed for the organ)

Bill