It's worse than none, it's basically useless. Take into account safety ratings of all Tesla's on the road (one of the highest) vs safety rating of all cars on t

It's worse than none, it's basically useless. Take into account safety ratings of all Tesla's on the road (one of the highest) vs safety rating of all cars on the road (average at best), and then think again whether 0.6 vs 0.4 says anything at all. The actual difference could be many factors higher.