So does stopping for stationary objects like metal plates on the road or overhead signs.

So, your argument is that no matter what choices were made about tuning, Autopilot isn't ready for real use?

Given the choices that were made, I don't think it can do the job it's marketed as doing, and I don't think I could safely and reliably supervise a car that's expected to partially drive itself.

I much prefer to drive a vehicle where I'm clearly responsible, but the (on by default) assistance features might help me out from time to time if I screw up. A computer doesn't get bored of checking if there's a slowing vehicle or (if it checks for them) stationary object in the path; but I'm pretty sure I wouldn't stay alert enough to jump in. OTOH, I also don't like using cruise control either, but that's not because I want to stay alert, but because without radar cruise control it's too much work to use, and I don't like the following distance options for the radar cruise control I have access to.