How so? My friend told me just last week that all the charging stations where full because even if 20-30 min might not seem like a long time, on a busy station the queues becomes intense. Meetings are missed if you don’t plan ahead.
"It's hard enough to get commercial 240v connections in the US"
Again, not an expert on US infrastructure, but any charging site will be getting a 10kV connection which will be then stepped down to whatever you need - it has to be converted to DC anyway so you need those transformers anyway. As to the feasibility of providing 10MW to a charging stop - really don't know, someone else has to answer this.
I'm not betting on hydrogen specifically because 1) it's too complex, and 2) while the volumetric density is within the realm of feasibility, it's still not great. But I am betting on fuel cells. Solid Oxide Fuel Cells in particular. They're already extremely efficient, and also produce high grade (i.e. easily recapturable and convertible) heat. And they can use hydrogen, but they can also use methane, ammonia, butane, propane, diesel, gasoline, or any other form of fuel (I've run one off of wood chips!). And that flexibility has a lot of power, especially with the future of abundant and cheap non-peak power costs and rapidly developing synthetic fuel technologies.