There’s another point here:
Setting aside the validation aspect, we are told it’s unfair for TW to compete in their own sex category because if they wish to pursue physical transition (as is their ‘right’) then they will be disadvantaged re their ‘right’ to participate competitively in sport.
And yet here are women making that choice and sacrifice all the time and just cracking on with it: by pursuing a ‘right’ to have children, women must accept that this will impact on their ‘right’ to compete, and they may be disadvantaged compared to other women who do not have children.
Sometimes there are costs to choices that must be accepted, we can’t always have all the things, and need to decide what is most important.