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Scoring is the most essential part of the game. It is the game. Taking away one way to score significantly changes the game.

There currently are rules governing it, such as the catcher must be blocking home plate in order for a runner to be allowed to attempt to run over him. Johnny Bench developed a technique that protected the catcher and still allowed him to tag the runner out with the same effficiancy as blocking the plate.

So catchers have a choice. Unfortunately for Posey, he just did a bad job of executing Bench's Technique, and got hurt. If everyone plays by the current rules and executes properly, no one gets hurt.