Interesting, I call that stuff "nannies for people with poor situational awareness". I suppose they have utility as the size of the vehicle you drive increases (would have loved it when I drove a fuel truck in the Army[1]). In a mid-size sedan or smaller, with an attentive driver, they seem like a waste of resources to me. Side effects of living in a bubble of car modders and street racers, who almost never buy anything brand-new anyway.
I wonder how blind spot accidents in the US are affected by driver education? I'd love to see a comparison of data between the US, Germany, and Japan on incident rates of such accidents...
[1]https://en.wikipedia.org/wiki/Heavy_Expanded_Mobility_Tactic...