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This effect only helps future car buyers, it doesn’t make the owners of vulnerable vehicles any safer or compensate them in any way.

Of course not. It is not like car makers retrofitted old cars with physical ignition locks on the 80s, either.

I wonder, would this also be a physical retrofit? There could be hardware limitations to change here.

It would even decrease the value of their property to no fault of their own. That sounds like something the manufacturer should be responsible for.