How do you know if they're not allowed to try, though? On the rare televised woman's matches I see, the play there is better than a lot of low division mens football I see. Point is, tying in with the original point, why are they excluded on assumption they'd be no good, rather than allowed to try and get rejected because a male player is better? Why aren't they given a chance to try? What if only 3 women in the entire world are able to play Championship Division quality soccer. Should they not be allowed because the average for women is lower than the average for men? Should controller players be refused to play against KB+M players just because it's assumed they'd get whipped? What if they enjoy the challenge, and would find one KB+M player kill well worth 5 deaths?
I'm principly against exclusion. Everyone should be judged by their own abilities in an activity, rather than a set of abitary factors. If they are rubbish, that'll be shown in the competition. Don't tell people they're rubbish without giving them the chance to show they not, even if they're mistaken.