Scott,
I hardly ever played right hand auto acc, even when it WAS available. If I am playing bass.....the only other thing I need is piano and drums. The arranger is used from the left hand when I need it.
The only reason for the switch was economics. These are the popular, new models and I know I can sell them if people see me using them. The PA80 is 2 years old already, and has an upgraded unit on the table .... wouldn't YOU trade it for a Tyros?