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Higher input voltage can mean a faster charge, and less amperage necessary to give the same level of charge.

Don't forget, the cars probably won't be running on a series of 12V SLA batteries, either. RV's use that electrical connection to supply the cabin with electrical power for accessories and amenities, not for powering the vehicle.

Widely known fact is that when you double the voltage, you can half the amperage for the same power output. Another widely known fact is that if you charge a 400V battery pack with 12V charger, you're in for a long day. Even at 110, it will still take nearly 4 times as many amps, and nearly 4 times as long to charge.

The point of the charging stations is a "quick top off", not an all day "watch water boil" event.