"rely on the feel of you finger hitting the glass to know you have registered an action."
Erm I think you have completely missed the point. Its about feeling that your touch pressed a button that was displayed, and that the phone detected it. Hence it only vibrates when you touch a button if you touch anything else it doesn't vibrate. Also you can type faster when you feel that it is working.
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"rely on the feel of you finger hitting the glass to know you have
registered an action."
Erm I think you have completely missed the point. Its about feeling that your touch pressed a button that was displayed, and that the phone detected it. Hence it only vibrates when you touch a button if you touch anything else it doesn't vibrate. Also you can type faster when you feel that it is working.