Since the advent of EVs, its not a safety issue imo. When Tesla's first came out, and the first adopters were all people that wanted to drive FAST, I was often surprised by them, especially since I always rode slightly faster than traffic as a safety mitigation technique. I quickly learned to use my eyes more.
My eyes are my ears and you cannot rely on sound to know who or what might be coming up from behind you. Mirrors and head on a swivel are way more important.
It’s been a thing since the Prius allowed driving with the engine off with parents complaining that the Prius is a silent killer of kids because they couldn’t hear them coming.