I use full self driving for long highway trips. I do however take the advice of the manufacturer and stay fully alert. It has caught situations where some bonehead is drifting into my lane or changing lanes without noticing me, and I didn’t notice them fast enough, and braked avoiding an accident. Like wise I’ve noticed it make mistakes and asserted control. My estimation is the joint probability of the model catching a dangerous situation and me catching it is significantly better than me alone. It also is able to navigate through confusing interchanges that I normally screw up by taking the second exit of four instead of the third or whatever.

I think a litmus test of “perfect” is a fair test, but leaves a lot of value uncounted in the mean time.

I think perhaps ignoring essentially everything Elon musk says and does and judge based on what’s in front of you is what works for me in not getting baited into the “is the Tesla FSD sentient and can do my taxes” hype cycle, with its requisite jadedness.