I think detecting a bored expression on somebody's face is a much more involved process than detecting the uniform vibration of a vibrator. Imagine how hard it is to program a computer to do the former, whereas there are sensors that could detect a vibration easily.
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I think detecting a bored expression on somebody's face is a much more involved process than detecting the uniform vibration of a vibrator. Imagine how hard it is to program a computer to do the former, whereas there are sensors that could detect a vibration easily.