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This would aid e.g. the "Stuxnet usecase" once the used computer hardware is known. Precise directional antennas could pick up the signal from a distance.

>where the attacker has physical proximity to the machine.

There may also be an option to use a directional antenna to pick it up from a great distance away.

Physical infiltration of networks isn't a fictional concept. It does happen all the time.

In theory it would help with exfiltration from air-gapped machines, although like you said, you do still need to get the code on there in the first place, which would imply it's not air-gapped all that well.

Scenario: broadcasting out passwords and PINs

Solution: bluetooth transciever silicon is <5mm square when packaged