Have to disagree there Gary, arrangers do not have (Or very limited) programmable real time controls, and one thing you want with modern music is to tweak the sound live, without having to wade through menus or have to keep pushing buttons to alter things. (The LFO for example) If you look at most Workstation/synth players they are constantly twiddling controls while playing.

Arrangers by their very nature are easy play instruments(They are basically all the easy play features from organs stuck on a single keyboard) where you can just push a button and everything is done for you, which is exactly what most home players want. (Only a minute percentage are used by pros)

Bill