The cost/benefit of replacing the pump with the timing belt became very apparent and from about 1990 on I refused to replace a timing belt unless the customer agreed to the complete package including all timing belts, the tensioner and idler pulleys and the water pump and also the cam and crank seals on some engines. It’s funny how some people object to replacing the pump that has no indication of failure but when the pump fails within the year and ruins the timing belt insist that the timing belt is under warranty.