So de facto banning some women from any kind of professional sporting competition is acceptable because it's too much work to include them? Why is that acceptable to you? And why is it necessary to couch these concepts in discussions about fairness when you yourself admit they are not fair? Excluding female people from female categories seems counterproductive to any attempts at providing level playing fields for women and girls in professional athletics.
Also there are other groups of women that are on average more physically capable then the average for women as a whole. Should they also be excluded?