Mild hybrids have been using 48V for a long time. There isn't much new here except that Tesla decided to do every component. That's going to cause quality problems with parts if they remain a tech. island in the industry, so trying to get everyone else on board makes sense.
Doing it for everything is the whole point, it changes the architecture of the car. Yes individual components but those cars had like 1% if connected devices at that voltage and were otherwise exactly the same.
For Tesla ist a replacment of something else, for previous vehicle was it was something additional for a specialized use case.
