I think the change happened some point in 2018. I had the dual chargers in my 2017 S, which only came to use at a couple of chargers somewhere deep in NJ. Otherwise, I never really had an opportunity to exploit it as there are few 80A Destination chargers around.
GTK I agree dual chargers seem pretty useless you have access to 80A.
My question is which model year X would I look for if I wanted the faster SC speeds. 2018+ as well?