The latch is on the car for CCS. It is only on the cable for chademo. Regardless, the main issue with high current is the cable resistance. You need very thick cables or they will melt. Higher voltage helps, but cable weight is a real issue at higher power.

P.S. NACS is just CCS with a different connector.

It isn’t just that higher voltage helps, higher voltage is the key factor.

Heat dissipation is a factor of amperage (solely) in the wire, and higher voltage means lower amperage for a given amount of power. Literally.

[https://en.m.wikipedia.org/wiki/Ohm%27s_law]

The challenge here is that above a certain voltage, insulation gets prohibitively difficult (and bulky), which makes solid state electronics to control and manage it also prohibitively difficult. And leakage current becomes dangerous.

For example, we could run chargers at 1 million+ volts, and use standard 12 awg stranded cables to do it with very low losses (and low heat) at megawatt charging rates.

But the insulation would be crazy thick (inches?) and if there was any damage or minor leakage, it would be very dramatic very quickly. Like ‘mini nuke’ type arc flashes. And because the distance you can strike an arc in air with 1 million+ volts is measured in multiple feet.

Even if the lock is broken, the pilot connector of the CCS connector is longer, so it would disconnect before the DC connectors would disconnect. Similar to how the D+ and D- lines of USB-A are shorter than the VCC/GND lines.