It’s not a quirk that makes it unfair for them to compete in women’s sports, it’s the fact that they’re not women.
If I’m a 240lb judoka, it would be unfair for me to compete in the 160lb weight class just because I feel thin on the inside.
If I’m a 240lb judoka, it would be unfair for me to compete in the 160lb weight class just because I feel thin on the inside.
Second of all, there are physical changes from hormone replacement therapy. associated with transitioning. This is absolutely not "240lb judoka feeling thin on the inside" and not absurdly cut and dry like you suggest.
These drugs do not "erase" the biological reality of sex differences.