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> Taken to the extreme you end up with something like "network connected physical machines aren't a security boundary" which is just silly.

1. This is why some places with secret enough info keep things airgapped.

2. OTOH, from what I recall hearing the machines successfully targeted by Stuxnet were airgapped.

Yeah, you have to move it off-planet to achieve an actual security boundary.

In our threat model the upper bound on the useful lifetime of the system is limited by the light-distance time from the nearest adversary.

Ah yes, the "maximally aggressive grey goo" threat model.