One thing is the risk that your device might become a paperweight with $300 smartwatches or home automation systems, another is to have them with $30,000 cars.

The problem is not that there is a risk, the problem is how the magnitude of the potential loss from that kind of risk when the risk applies to cars.

Rationally there should be a lot more consumer protection rules on things were people have to work many months or even years to earn enough to buy them than in things that cost the income of a few days or weeks of work, at the very least the kind of information forcing the full disclosure upfront to customers of such risks and their consequences (if a brand's electric car will literaly become a paper-weight once support from the manufacturer ends, that should be shown in every advert for that product using a very large font).

The current combination having such risks associated with massive potential losses whilst the manufacturers actually hide that from customers and do little or nothing to reduce the impact of such risks, is unnacceptable.