> What happens if you fully press both the acceleration and brake pedals? I would hope for the brakes to be more powerful and stop the car, is that the case?

You get a “both pedals pressed” alert and the accelerator is ignored, so the brakes don’t even need to overcome the engines. The behaviour is logical at least since tesla added blended braking (though I’d assume it also did that before then).

However as soon as you release the brakes the car starts accelerating as whatever the throttle is at again.