The whole fast charge thing is mostly marketing to convert people from "gas car mindset" into getting an EV.

The reality of the situation is that most people who buy an EV will use fast charging only a few times a year. The majority will be charging overnight to recuperate their daily use, which amounts to drawing <1% of a MW. The grid, in it's current form, is totally capable of this.

What would be a strain though is large ultra fast charging stations along major travel corridors. But I'd still wager that those will be overkill for most.