If it's at least theoretically possible for a knowledgeable user to fix their devices, that's a pretty big improvement over it being a totally unfixable black box. For something like a lightbulb most people wouldn't bother, but if it's something like a car, a person without the technical skills to fix it themselves can pay someone else to do it.
It’s an improvement ideologically, I suppose, but not a practical reduction in economic damage potential. In a very real sense it doesn’t matter it you have quit making something seriously damaging if you need to disable millions or hundreds of millions of devices—ie some automatic update functionality is in itself hugely more helpful than just opening it.
Ideally we would have this suggestion in addition to a stick to ensure people have an incentive to sell relatively secure hardware.
