The practical solution here would be closing the feedback loop with customers. The business does want happy customers, it's important they return to purchase in 5 years. The problem with car companies is that they don't get immediate feedback (telemetry, tickets, etc) when they do push an issue. And they obviously don't have gradual roll outs the way tesla does.

Rather than hamstring all software by requiring DOT testing before firmware updates are published, follow Tesla's model which has been very reliable within the industry