The problem is that probably over 98% of the roads in the country are almost 0 chance of unexpected event. Nearly empty roads, small towns and cities with crosswalks that never see a single pedestrian.
In the bay though. Holy crap driving here was a wake up call for me. You cannot drive distracted here. I've driven in every major US city. The bay is by far the worst. Yes even then NYC, ATL and Miami. Chicago or Houston is a probably 2nd worst.
At the same time my partner often gets mad at me for refusing to do anything but focus when I drive. So I agree in general but I'm not everyone. This device seems like it will help people avoid incidents.