Hmm, ehhhh, well..... As someone that's around a lot of automation every day, I'd be kind of the opposite. In a production environment the machines are bullet proof, the visions systems nail their jobs, etc. On the road is so dynamic I think I'd not chance it. On a clear, sunny day sure. Mountain pass with a blizzard no way. You didn't do it wrong, and FSD isn't bad, but in that situation I'm going to spend a moment disagreeing.
I'm not a Tesla owner, but know a few owners (3) and have been in and / or driven their cars. Like them overall. But I wouldn't do what you're describing! I may have to get their thoughts and see if I'm convinced otherwise.
Very much looking at PHEV's and EV's for my wife's next car. Not for any FSD thoughts but more some fuel savings and being nicer to the planet. And... TBH I'm partly in it so we can get 240V to the garage and I can use it to brew! I'm not at all kidding about that part.