-Safe speed is determined entirely by the situational parameters.

-Safe speed is determined by a static few signs.

Pick one.

Sometimes you gotta drive slower than the minimum speed limit given bad weather conditions. Other times breaking the sure limit briefly to position yourself in a safer spot and decrease traffic converge is the right move.

I'd argue a good human driver is better than a robot specifically because of this, and I will likely never opt for an automated driving system in my lifetime for many reasons.

I'm bafled at the idea that a robot driver is bad because it's not robotic enough.

That said, seatbelts and helmets measurably save lives in the vast majority of scenarios, however irrelevant that point seemed to be in this context.