I also wonder if we are doing a disservice to transgender individuals by allowing gender to substitute for prerequisites that are based on differences between sexes. This allowance lessens the apparent distinction between sex and gender that is the basis for modern gender theory.
We're allowing two components of gender, identity and expression, to equal the value of a given sex. However, modern gender theory includes sex as its own component of gender. Therefore, gender alone cannot inherently make sex equivalent to some combination of sex, gender identity, and gender expression (unless the value of identity and expression is a combined zero).
Here are a few of options:
1. Get rid of men's and women's divisions in favor of some other criteria.
2. Include more divisions with qualifications that do not solely depend on sex.
3. Require all competition divisions to be sex-based, regardless of gender.
Some may argue that men's and women's divisions were gender divisions all along. However, I would point to the very existence of separate women's divisions, given current and historical performance and expectation for each respectively, as evidence that the divisions were sex-based, not gender-based.
I do not favor getting rid of sex-based divisions, because that provides unequal opportunity for women. I do not favor requiring all competition to be solely sex-based, because transgender athletes undergoing therapy may be at either a prohibitive disadvantage or an unnatural advantage, depending on the circumstance. Rather, I would favor the addition of divisions that are not solely sex-based, rather based upon other things, such as gender.