Since the designer designed the circuitry.
Another thing is that this is about tactile sensory units. Do try to stay on topic if you wish to discuss the subject of the thread.
Electrical circuity is used to transmit, and receive, information. Elements of design.
Remember, tactile sensory units. When the sensor senses, information is produced. Information formatted to convey specific information. Programming is present to properly convey the information in a usable and repetitive manner.
If you believe that the tactile sensory units were designed, and created, for a purpose other than tactile sensory units, please present your reasoning for such a view.
Language is created to exchange ideas and views, convey information, record information, disseminate information. Where language is found, intelligence is an integral part of it.
Tactile sensory information is basically the same, touch something hot and the designed system goes to work.