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I just think that a professional is a professional because he knows his business.
they may know their business however there are tons of coins not graded properly. this can be confirmed by resubs where the grades are changed. they are not infallible and there is no way that a grader can know everything about grading every series and the nuances for every series such as die polishing, strike and die matching etc. plus the fact that they only have a couple minutes to assess a coin, if that ,and move on to the next one.
i am not convinced that graders and series are matched. I think whomever is up next gets the next coin. just my opinion. if you luck out and get a match with the right grader the grade imo would be more accurate.