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However, in disc golf you are competing with other people on other cards that may have the rules called on them differently. This certainly gives someone a competitive advantage. You have player A who commits a foot fault like the one you described twice on a par 5 hole. He gets called both times: not he is down a point, and he is expending focus making sure he doesn't foot fault for the rest of the game. Now you have player B. His card is more lax- guys C, D and E figure "we won't make calls like that, because if none of us make those calls no one really gains an advantage." Player B also foot faults twice on the same hole, but isn't called on it. Player B doesn't really have an advantage over C, D, and E. But her certainly does over player A. Not only has he been spared a point over A, but B also likely has a mental advantage since he isn't thinking as much about foot placement so has more focus on other elements of his throw.
If you are playing a round where you are only competing against your own card, then fine: no harm getting a little lax on the rules as long as everyone is given the same grace. But if you are competing against people on other cards, the rules as they are written need to be obeyed.