There are few (no?) modern consumer vehicles that don't have safety-critical software somewhere and you couldn't legally drive any modern vehicles that don't have working software besides.

It's literally just a cultural issue that they think of themselves as car companies first, and good software culture isn't in their corporate DNA. 5-10 years ago literally no one understood that, but most executives are starting to get onboard with the need for changes and flail their way through them.