[ajross]

I can't tell which side of the argument you're on here. The driver in the Tesla case didn't "drop a pen". Your Subaru is a recent car and not a 2018 Tesla Model S (which was launched before the Full Self Driving product everyone here seems to think they're arguing about existed!).

And... no pilot is allowed to operate any automatic pilot system without supervision, I genuinely can't imagine that's what you're implying[1].

[1] Your "drop a pen" example seems deliberately constructed to invent a scenario where you think you're allowed to stop supervising the aircraft because it sounds harmless. It's not. You aren't. And if the FAA traces that post to your license I bet anything they'll suspend it.