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I agree with what you said about brakes overcoming the engine. I've seen tests which show it works on even monstrously over-powered cars, but it can feel like it's not working and if the driver reacts wrongly to that, then it may no longer work.

I think stopping the power from going to the wheels needs to be an easy option. I wish there was more importance given to being able to easily do this.

I think the two options are shifting to neutral, or turning off the engine. I tested in a late-00s automatic BMW, and you had to hold the start/stop button for what felt like a very long time to turn the engine off if the car was in Drive. In an emergency, I think most people would give up long before it turned off. In that car, it was easy to change to neutral though, so I don't have a criticism about that design. What concerns me is cars with the same approach for the start/stop button, but where it is hard to get to neutral. I think in the Toyotas which had unintended acceleration issues, it wasn't easy/intuitive.

Edit: Another comment reminded me of something I forgot to mention above. You don't want turning off the engine to be the first resort because you lose power steering, and eventually, power assisted brakes.