So how do you stop then if the batteries are (close to) fully charged? You'd need to shunt that power into a big resistive load, and then dump that heat.

I’ve long foundered why we don’t ditch the friction brakes.

Just have the battery stop charging and report 100% full when it’s only 98% (or whatever) so there is enough capacity for some solid emergency stops in the first few minutes of driving.

Even if you have to resort to the resistor, who cares? It’s not like this is a common scenario