There were few that even USED the chord sequencer from Roland while it was out. I can't count the number of people I showed this to on their own arranger, and were amazed at what it did... Mind you, as I've always said, it's one of those things that mostly benefits the better player (not much point freeing up your left hand if all it can do is One Finger Chords, anyway!), which is generally not the meat of the arranger market.
I believe that there are two unsung features that radically change how and what you can play... The CS for arranger mode, and the Mark/Jump capabilities for SMF play. I guarantee that 99% of the people with these features on their arrangers are not using them. That doesn't mean that they are unimportant features.
Just that few ever explore new capabilities once they have a little 'system' down. I mean, possibly half of even this forum don't use Registrations much, but simply call up a 'free panel' setting, and then select styles and sounds on the fly. Does that mean Yamaha should drop having Registrations? Because quite a few don't use them?
I doubt you'd agree with this, Ian.
For the two handed player, for the player of a secondary instrument, the CS opens up possibilities that can be done in NO OTHER WAY. That few can be bothered to learn them isn't the problem of the feature, it's the problem of the PLAYER...
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An arranger is just a tool. What matters is what you build with it..!