It's very dangerous, but it used to be considered extremely dangerous to update anything in production until the likes of Google started doing it nearly two dec

It's very dangerous, but it used to be considered extremely dangerous to update anything in production until the likes of Google started doing it nearly two decades ago. The secret sauce is to use DevOps: automated testing and so on. But it's a culture the auto industry does not have. They can't do it for the same reason most banks for example can't do it (yet), and it's taking them years to get there.