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Good luck re-writing 25 years of C++ though.

It was Google's study that showed almost all bugs are in new code (and this was also the case of this incident)

You don't need to rewrite everything to prevent the majority of new bugs, it's enough to protect new code and keep the battle tested stuff around

You can do that for new binaries. For existing ones you can't really or you get in a worse place for a long time.