We could do that! I'm just trying to say that given categories based on (biological) sex, we should find some criterion based on biological sex to sort people into said categories, which the OC decision seems to do (at least better than the alternatives I have encountered). I don't have a problem at all with finding different ways of defining categories for competitions.

Re: anomalies - I think this is just unavoidable in any sort of category system, and I don't have a good solution for it except to consider frequency and severity.