Dealerships are bound to change/replace a certain part at certain kilometers regardless of the condition of the part. This makes them 1: Sell their parts more. 2: Gain more profits. 3: Longevity of the vehicle as they change new part even before there's a need.
Every dealership does the same. They go by 10, 20, 30, 40 and so on thousands km services and hence change/replace parts per their manual regardless of the condition.