Using seniority is the easy way for the assignor to place umpires. That way he doesn't make judgement calls on who actually is the best umpire for each position. Letting the umpires choose, based on seniority, is the second easiest way to do things.
Please don't equate easy with fair, correct, best or any other proper term. It's just the easiet.
I've come across only one fellow that would only do plates. I think it was more of a mobility issue (he didn't like to move), than a pomposity one. Perhaps a touch of both.
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