I do software quality assurance, and it wouldn't surprise me if this was put in by request of their QA department. I don't know if a human looks at every PCB, b

I do software quality assurance, and it wouldn't surprise me if this was put in by request of their QA department. I don't know if a human looks at every PCB, but however many they sample to QA, this would be a quick way to check an important feature of the hardware.