There is not a direct physical connection between the brake pedal and the brakes, or the acceleration pedal and the... not even sure what this would be. The n a

There is not a direct physical connection between the brake pedal and the brakes, or the acceleration pedal and the... not even sure what this would be. The n admission valves on the cylinders? Unless you consider "direct" as "passing through 5-50 different parts that each has an effect on the next in the chain", which is the definition of indirect. I'm not putting words in your mouth, I'm pointing out you're using the wrong words. You're neither relying on "physics", which would mean a failure of the system would be caused by a failure of "physics", meaning something like the Maxwell's ecuations turn out to be wrong, nor on "direct connection", unless the brake pedal is directly pushing on the brake rotor, which is obviously false. Of course there's no problem with saying you'd rather rely on mechanics or hydraulics than electronics or software. Though, to use words your way, tesla is not relying on "software", but on "math".