The sockets would need some work for decent power transfer - it needs to do at least the 150 watts that USB-C can do, and preferably 150 kwatts for charging a car.

For 150 watts while maintaining backwards compatibility, all that's needed is larger contact area (curved spring clips) to support 3 amps and the use of 48 volts after negotiation.

For 150 kilowatts we'd be talking some cutting edge stuff, but not beyond the realms of possibility. Specifically, you'd probably need to use voltages up to 20,000 volts, 10 amps, which is going to mean you need to have mating and sealing rubber isolators on both plug and socket at least 3mm thick between poles. At these voltages, you cannot have air between the pins, so it must be a hermetic seal. You'd also need to measure leakage current and keep the cable capacitance low enough that when someone cuts through the cable with scissors the voltage can be dropped in microseconds to prevent zapping them.