I had a talk with one of Europe's top Roland arranger demonstrators (I won't say who, but you have all seen him on some of Roland's own promo material) and he admitted to me that despite demoing G70's and E80's for Roland, he still uses a G1000 on his own gigs, strictly because of the Chord Sequencer...!
He gets around the sound differences by using a TD-10 module for drums, a Nord Electro for organs and Rhodes, and a FantomX for other sounds (plus a few other things) so in essence he is using a G70 WITH a Chord Sequencer.
Now if a Roland demonstrator can't gig without one....
I guess it's just one of those 'pro' features. The better your left hand is, the more it makes sense to use a CS. If you are already challenged enough just to play the right chord, right inversion at the right time, it's not going to help you much (might explain why so few are gung-ho about it!). But if one of Roland's top demonstrators admits that he won't gig without one, perhaps a few more of you might realize just HOW important this feature can be to a good player...
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An arranger is just a tool. What matters is what you build with it..!