Okay, please, explain me then what an arranger kb is!
I've bought the V-50 from a musician who was gigging as a one man band. Isn't it exactly that what you "arrangers" are doing?

Now I'm really a little bit confused...

On the other side, isn't it the wish of all musicians to have optimal sounds in all points? So, it seems to me that it were much better to have about 2-5 keyboards and synths because of their different sound abilities. The one kb has good piano sounds, another one has some good strings and brass, the next one has some fine oriental sounds, and so on...

I'm really wondering and curioused to hear more about this thematic...