What if golfers had to use only the same golf clubs and golf ?

Actually they are using the same clubs and , they have to fit the parameters of the USGA or they would not be allowed. It would be like making baseball players use the same bat or a tennis players having to use the same rackets. You can see it can get ridiculous. The are set up for different age groups es and swing speeds, so you would put to many people at a disadvantage.