I have DCC on my CS (mk 7) with 19's. I use it mostly in individual setting where, suspension is soft, but everything else apart from engine sound is in sport.
On a good condition road or I feel there is an opportunity for some fun? I select sport. If the road surface is bad and I want lighter steering, I select comfort mode.
These are the 3 modes I use as often as is practicable, i rarely use Eco or Normal, only to see if there is much difference to the other settings, at the margin there is.
I haven't driven a Mk8 so can't comment on the ride with 18's, for a mk7 I would prefer it had DCC with 19's.
I think it makes a car on 19's easier to sell with DCC, try finding a mk7 CS with DCC, it seems to be 1 in 10 have it and standard fitment on the CS-S.
I can see DCC being a desirable option on the Mk8 now it has infinite adjustment?