i bought mine earily 2018.
I was told supercharging is owner dependant, not car.
If FUSC is that important, you want to find a earily to mid 2017 as i believe that was the cutoff.
Basically i got FUSC as a last min promo from tesla, the regular FUSC expired 2017, which followed life of car.
But that late 2018 will most likely have MCU 2.0 which i feel is 100000000000000% more benifical then FUSC, unless u really live in a rural area where there are no lines for super chargers, or your commute is that great where FUSC can be a substantial cost savings.
Trust me, there is a new level of "feeling entitled" as tesla owners thinking they were ahead of you in line at the super charger, which is why i usually avoid them now, unless its as described above.
I absolutely need to use the SC, or i see there is a lot of empty spots so im gonna grab a quick charge while i get something to eat ordeal.