Faster charging improves things in more EV-friendly areas as well.

I live in Southern California, and if I take a trip on the weekend that is more than the 240mi. freeway range my Kona gets, I'm never worried about being stranded, but I have waited in line for an hour to charge; sub-10 minute charging would cut wait times too, and is probably necessary if the US both wants to electrify its transportation and still have people take road-trips on major holidays.