How does the classic example of the Head Support for Commuters illustrate a failure mode despite addressing a real discomfort?

Answer

The device itself causes significant social embarrassment, enforcing uselessness via social awkwardness.

While addressing the discomfort of hitting one's head on a train window, the device is conspicuous, leading to social stigma that makes it undesirable to use.

How does the classic example of the Head Support for Commuters illustrate a failure mode despite addressing a real discomfort?
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