Surely, most users never used the chord sequencer[I think it was a learning curve most did not want to understand], but for those that used it know what a great tool it is..Laying down in real time, a verse, and continuing in realtime..playing another instrument[guitar , trumpet etc], in real time..adds a demension that most have never considered..
BTW, you can save chord sequences for quick loading for your performances..

Secondly, for song writers..a very valuble tool indeed..You may have a song in your head, maybe record the chords[maybe as you would just playing a piano], using chord sequencer...now you can play back the chord sequence, listening to any style, creating different feels and ideas to your song..You can add fills , variations etc, continuing the developement of your song...All this operation can also be recorded as a standard midi file for your finished product..The chord sequencer is indepenent of your 16 track sequencer..
Likewise, saving your chord sequences as you go along[maybe to finish your project at a later date].
The VA had what is called 2nd track, but not as usefull to me as the "chord sequencer"..
My guess is that the G70 incorporates the same 2nd track feature as the VA series..
Since I have not tried a G70 yet , I can only guess for now..

Just one more reason, I will still keep my G1000, even though I will have a G70 too..