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>with "Yet" when I clearly spelt out the trade-offs

It was with regard that 800V was the driving factor, it'd be possible to have 'fast' charging earlier with existing infrastructure, even home.

>be safely charged with the said 3 phases?

The limiting factor for charging would be charging current in lots of cases. Getting 60% of 75kWh battery, it's 45kWh to charge in 20mins, the output should be ~150kW (90% efficiency) or 325A (on 400v), 4x 12-15mm wires.

Note about 'home' charging - three phase 32A is widely available domestically or around 6-8h to fully charge