It may be true that men have more latitude to change their variations or codas but there are certain moments in ballet that are indelible. If Prince Desire doesn't do a double tour-soutenu combination in his variation, then I'm asking for my money back. The Black Swan fouettes are in a catergory by themselves. Even some of my non-ballet friends know of them. When that seminal moment arrives in the Black Swan Coda and Odile launches into the fouettes we say "Ah! Here come the fouettes. Let's count" or if she doesn't do them then we say "What will she do instead?" The point is that you notice if she does or doesn't do them.
I also think it's important to judge the art on the level it's meant to entertain. If I go see the Bismark high school ballet club do Swan Lake, I'm ok if the ballerina opts against the fouettes. I don't need to see her break her ankle for my entertainment. But if you advertise yourself as City Ballet, or ABT, or The Royal Ballet then we're talking about world-class ballerinas and world-class standards. I don't think it's too much to ask Miranda Weese to do the fouettes. It may not be fair that some women turn better than others but that lack of homoginy is what makes ballet so beautiful. We all have our strengths. And it may be true that the fouettes are there because Legnani could do them and no one else could but I have to believe that if Petipa didn't think that they advanced the plot or added to the seduction of Siegfried or do any of the things that we associate them with, then he could have/would have taken them out.