I have never understood the reluctance to use this feature, or scream loudly for it to be added to their arranger, as this function perfectly bridges the worlds between normal keyboard players (who either have a band or a sequence playing the rhythm changes) and arranger players, who control their own chord and song structure, but pay the price for that freedom by having their LH permanently tied up endlessly inputting often repetitive chord changes.

All of the two hand freedom of SMF's, with none of the structural rigidity of SMF's.

If you think about it, the CS on the one hand, and SMF 'Markers' on the other, and BOTH systems' shortcomings and limitations have been pretty much removed. We've come a long way from either arranger mode OR SMF mode. Both are far more flexible than they used to be, and some arrangers may be able to mix and match in the same song as needed. Some arrangers allow you to go seamlessly from arranger mode to SMF and back...

It's a much more flexible world than it used to be. All you have to do is drop the thinking that 'unless I'm actively playing the chords, it's not arranger playing' purism. Whatever allows you to play at your best is what works best...