This coverage has been a topic of discussion off and on for years in my neck of the woods. We don't teach it as trainers because in lower levels of ball (e.g. high school)if the throw gets by the third baseman there is often only a dead ball line (as opposed to an enclosed ballpark) where the ball ends up. If the plateman comes inside the diamond for that throw at third, and the base ump isn't sprinting (and sometimes even if he is) there is nobody in position to see if that ball crosses that line. If the base ump takes the runner into third, and the ball gets away there, the plateman has only to take a couple of steps to see it clearly.
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