BBC looks at ways audio engineers have retained classic sounds of objects. The shutter noise on a digital camera is entirely uneccessary. An ENV hydrogen-powered motorbike is silent, but an artificial roar warns "road users it is approaching." These "manufacturers of cars, phones and cameras are merely responding to their own archaic ideas of how things should sound."
About ten years ago, car doors no longer made the classic openning sound due new safety standards in car manufacturing that made parts of the car lighter and doors heavier. Instead of a clunk, car doors openned with a tinny sound. To make the car sound "more expensive ... dampeners were introduced into the door cavity to muffle the tinny effect and engineers altered the locking mechanism to make just the right sort of click."