It is as fair for me to Alt-F4 as it is unfair that the system places me in settings I don’t want. I have played 95% of my games on Arabia since 2010, and barely know any other build order, do you think it’s fair to force me to play Islands once in a while because 1 guy in the lobby decided to ban Arabia and was matched with me, when the system could have prevented it in the first place ?
It doesn’t matter how much. By decreasing Elo artificially for any other variable than skill, you only create unbalanced games until people go back to their true rating anyway.