AM radio is a tried and true technology. It's super simple. I think at the very least they should come to a compromise in which certain emergency frequencies are available/accessible in all cars.
My best guess is that Apple won't do it because their plan is to phase out passwords entirely. That's what that whole FIDO Alliance (https://fidoalliance.org) is all about.
I think that ultimately a password tool needs to be available on multiple platforms, like 1Password. Having it just be on Apple stuff just isn't gonna work for the many Windows and Linux machines I begrudgingly have to interact with.
I don't think being able to scan this is completely new. Perhaps this specific technique is, but I've heard of this being done at least once previously in the past decade.