Korg's have a chord track, too. (EDIT... It seems they may have dropped it on newer Korgs, anyone confirm? They USED to have it, I remember that)

Thing is, they are all 'step input' systems. Very slow, compared to just playing the chords in. All Chord Looper/Sequencer systems (OK, just Roland and Korg, so far!) allowed you to STORE a chord 'loop' once you played it in. Admittedly, it would be nice to have some editing capability, too, but if you goof, it's not much hassle to replay it. If you are doing it for composing purposes, you can slow down the tempo radically to give even the most clumsy of players enough time to think what's next, I would have thought.

I still don't know the details about Korg's system, but on the Roland's at least, you always had the option to record the chords alone, or WITH their fill and variation changes. Best of BOTH worlds.

I would doubt that Korg have DROPPED their chord track and simply replaced it with the Looper. Bet you BOTH methods still exist...