Most homes have 220v devices that people use safely every day without electrocuting themselves. If your really concerned about how fast they charge just run a second line and wow it's charging twice as fast. On top of that decent charging stations are well over 90% efficient much worse than that and they start dumping a lot of heat which harms the battery. 3 * 220v/50amps * 90% efficiency will fill that 60KW/hr pack right quick.

So sure, it takes a long time to fill the tank using a normal extension cord, but then again most people can't refill their gas powered car at home so it's still a net win.