Actually that is not true. The first thing one is taught when they get into baseball umpiring is where they are to set-up when they are behind the plate. They are to always set-up on the inside part of the plate. This will help them to best see if a pitch grazes a batter, the inside corner, and it also offers the most amount of protection.
Every baseball umpire camp that I have been too and every baseball umpire and instructor at every level that I have talked to all say that the home plate umpire is to be on the inside part of the plate. Watch any real-life game at the high school level and up and every competent umpire will be on the inside part of the plate.
This game, as great as it is, has this wrong.