That's a good point.....IF you don't play out alot. Those of us that are always on the go need a tight, fast setup and midi modules are just more stuff to lug around. It may be quite some time before anyone is fully satisfied with a keyboard arranger, but there's always hope!
Personally, I'm sick of waiting for a better deal to come along. I'm playing what I have for a while longer and concentrating on the music - NOT the instrument. All I REALLY need is a mic cable and a drum machine - the rest is all gravy!