This also has relevance to the questions surrounding the effect of the "trimmed mean." Nowadays, it hardly ever makes any difference -- if you throw out a score that was somewhat lower than average and a score that was somewhat higher than average, that doesn't do much in determining who won, and frankly is not very useful in drawing conclusions about bias, collusion, etc., either.
If I remember correctly, the original purpose of trimming was to eliminate keystroke errors. In less techy times, once in a while a judge would accidentally hit 0 instead of 9 in entering a GOE. In even less-techy times, Tim Woods lost the 1968 Olympic Gold Medal (to Wolfgang Schwarz) when a judge held up the wrong card on one of Wood's figures. (Woods went on to win the next two world championships, and Schwarz opted for a lifelong career in human trafficking.)