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> Have you never even been so curious as to touch it?

The correct design is to create it such that it serves the unsighted without enticing the sighted to mistake it for a button and touch it for a function it does not perform.

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I touched it and discovered that it gives tactile feedback for the deaf. Seems like the correct design to me.

As another commenter pointed out they could have made that surface not look like a button, then you would not have to discover that UX function, which is superior design. Good design is intuitive.

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