Only 10% of the entire redshirt population was lost during the three year run of Star Trek. This is less than the 13.4% of goldshirts, but more than the 5.1% of blueshirts.
Is this really about “close ups”? However have hundreds of other TV shows managed to get shot without sweater-continuity?
And the percentages aren’t as important as how many actual individuals were killed, no? Ten percent of, say, 3000 redshirts is 300, but what if there were far fewer gold- and blueshirts overall? Isn’t it the overall number of dead redshirts that contributes to the viewers’ perceptions? Even Trekkers aren’t/can’t sit there “doing this math” every time they tune in.