If you watch the videos more carefully, you will notice the people who speed by at 85 MPH later enter the screen again, because that is the nature of freeway traffic.
I predict that a few hundred of these on the road will measurably improve safety and decrease severe congestion by being that one sane driver that defuses stop-and-go catastrophes. In fact I think CHP should just contract with them to pace 101 in waves.
"Waves" are really what we would want them to prevent: https://en.wikipedia.org/wiki/Traffic_wave
The autonomous cars can prevent these waves from forming, which would get people to their destinations faster than speeding.
If you actually thought adoption would benefit us on it's own rather than seeing it a roundabout way to enforce rules that you want to see enforced without buy in from the public you'd want these cars to behave in a way that makes it easier for them to exist in typical traffic.
Normal human drivers tend to lift off the gas and only brake when they decide that just lifting won't do.
Don't EVs light up the brake lights when regenerative braking engages?
I've definitely observed Teslas coming to a halt, and the brake lights only kick on at the very end. I don't know how widespread the problem is, but it's very annoying.
If you're annoyed by the braking lights on a Tesla, it's because you're following too (dangerously) closely.