I am always saddened by the fact the United States is locked into a sub-optimal grid topology

I am not sure I understand? Most of the transmission lines I see are three phase. It is only at the residential distribution level that we see single phase. Most commercial sites are three phase and as noted most DC fast chargers are three phase. I don’t see anything sub optimal about that.

the 85 mile total range that a full $20k 100kwh battery pack will give you.

It depends on the weight of the vehicle. A 100 kWh pack might give you 300 miles of range at 3 miles per kWh. Also batteries are available for $100 to $150 per kWh so that might only cost $10,000 to $15,000.