Who are you arguing with? On the first point (that there is a well established advantage due to male physiology) isn't something that I think any of us disagree on. On the second point (a blanket ban on trans persons competing) I think only Metaphor has argued for, and I think it's almost entirely premised on the impact of puberty.
I think it's worth being careful with language here. I have not advocated 'banning' transwomen from competing. I have advocated that biological males compete with biological males only.
So far as I know, you're the only person who has proposed that people who do not go through a male puberty at all, presumably including children that take hormone blockers starting at about 12 and them do HRT and testosterone suppression, should be allowed to compete in female leagues. You seem as if you feel that everyone is arguing with you about that position... but I don't think anyone is, because we don't have any examples to look to for it. I have no opinion for or against that, I don't know of anyone who has done it. Most of the people in this thread have been satisfied with reasonable testosterone limits in place for competition in a female sport, even if that isn't really sufficient to eliminate all of the advantages of a testosterone puberty.
It's true we don't have many examples (or any it seems), but Jarhyn is plain wrong in his premises. Natal males and and natal females are different from before birth, and it begins with a flood of androgens in the womb for males. The competitive advantage that males have does not begin with a male puberty but before they have drawn breath.
Indeed, although I am not a feminist, feminists would also argue that natal males have been treated differently to natal females and have a non-biological social advantage as well.
Jarhyn is also being dishonest about what trans activists want. Trans activists do not want having undergone a male puberty to bar transwomen from competing with women. Trans activists do not want any gatekeeping whatsoever in order for transwomen to compete with women. Trans activists want Andraya Yearwood to compete with girls (which he does) even though he had no medical or hormonal transition at all.