From a practical point of view, how do you imagine this playing out?

If we remove the gender division from, say, javelin throwing (random choice; current difference in world records there is currently 30% for reference). Now there won't be any (cis) women competing at the top level any more.

So somebody goes ahead and creates a women's division (or whatever you want to call it). Should we somehow forbid this? Or would it be required that they accept any transgender individual in any state of transition? And either case is just "back to square 1" - no cis women have a chance. I don't see how "let's remove the 'women' category in this competition in the interest of fairness to trans people" is improving things for anyone...