I love Traffic-Aware Cruise Control about 99% of the time, especially in dense traffic where the speed keeps fluctuating for whatever random reasons it does in dense traffic. The car does a great job adjusting its speed to the varying traffic, and maintaining a comfortable following distance. And when the traffic ahead comes to a full stop, so does the car, smoothly and safely.
This all works great when we are sort of part of the traffic, following another car. The exception is when traffic has stopped up ahead, but so far we're still moving at speed limit. It's clear where I am, but seconds ahead it won't be. In this situation it's scary for me and likely for the driver ahead, if they happen to be looking in their mirrors. The Tesla maintains full speed long after I would have begun slowing. I'm unwilling to play chicken with the computer to see whether it will really stop in time, so I brake on my own.
One, this confirms what Tesla says about we drivers are ultimately responsible for safe operation.
Two, I wish it looked farther ahead and did a better job in this sort of situation.