it's not as far as your experience goes - you press pedal, it accelerates. You turn the steering, it goes the way it turns. What the car does is deterministic.
More importantly, it does this every time, and the amount of turning (or accelerating) is the same today as it was yesterday.
If an LLM interpreted those inputs, can you say with confidence, that you will accelerate in a way that you predicted? If that is the case, then i would be fine with an LLM interpreted input to drive. Otherwise, how do you know, for sure, that pressing the brakes will stop the car, before you hit somebody in front of you?
of course, you could argue that the input is no longer your moving the brake pads etc - just name a destination and you get there, and that is suppose to be deterministic, as long as you describe your destination correctly. But is that where LLM is at today? or is that the imagined future of LLMs?