You know what else haptic feedback enables? Covert/concealed operation. Instead of a blinking light or sound, that would give away the activity to an observer o

You know what else haptic feedback enables? Covert/concealed operation. Instead of a blinking light or sound, that would give away the activity to an observer or reveal a hidden photographer, the vibration allows the operator to get information without revealing their presence or action. This could be a good or a bad thing, depending on which end of the camera you're on and what the situation is.