Wow, one of those rare threads where there are excellent points in nearly every post (and with no animosity). Obviously, there is no single answer (what was the question?) but the point is, nobody is completely wrong (or completely right.....sorry, Diki

). My own personal problem with arrangers is that I have a really difficult time accepting them as legitimate instruments. I have much less of a problem with synths, including "workstations". When you can create music, not notes, not chords, but MUSIC, by pushing a button, it's hard to elevate it much beyond a very sophisticated ipod. This is not to say that I don't enjoy mine immensely, but I have never taken one out on a gig (although I had G800's, G1000's, I5M's, etc. at the time). To those people that CLAIM to play (exclusively) IN A BAND using left hand bass 98% of the time, I say, HORSES**T. If that was how you viewed the role of the keyboard in a BAND, then why not use a much cheaper and much more powerful, synth (in split kb mode).
As much as I'd like to believe that the secret to greater acceptance of arr. kb's is in the creation and production of better, more modern, more sophisticated, styles; I really don't think so. This would do nothing to legitimize the instrument, in fact, it could have the opposite effect. Let's face it; the ultimate arranger is the DJ station. The Arranger keyboard exists somewhere in the gap between acoustic instruments and mp3 players, and more sophistication moves it closer to the mp3 player. Next up....practice your lip-syncing, boys.
chas