Oh sorry also, yes to trans women in women's sport, although there is a slightly complicated conversation here about elite women's athletics, which is the only place I've been convinced it could be an actual problem. But we can't have those kinds of subtle conversations until we accept everyone's basic right to have a nice time enjoying sport, so at the moment I hold the line: trans women should compete as women
Its not a slightly complicated argument, its a really simple argument that we divide sports by sex as its sex that affects performance potential, not gender identity. Gender identity has no impact on performance. Its makes no more sense to segregate sport by gender identity than it does by eye colour or hair colour. Its meaningless.
And I am fed up to the back teeth of people devaluing womens' sport by saying it doesn't really matter and isn't really important, so we can let males into it. Amateur sportspeople care very much about their sport and their position. They often train very hard, and commit a lot of time to it. I run. Results are posted by sex and age as these are the two characteristics everyone has, and which affect performance potential. Men and women look to see where they are placed within their age and sex category. As you age, its how you see how well you are keeping up, or even progress, your fitness as your times will inevitably start to increase as you slow. But you can see if you are improving or maintaining relative to your age and sex category. These categories stop being helpful to women if males are included in them. Women can't see where they are positioned if males are in their category. We already have an issue with girls and women dropping out of sport at a higher rate than men. We combat that, not increase it by allowing males in and signalling to women that this does not matter as they and their sport does not matter.
Now if amateur sports don't really matter, so positions don't really matter, why not get rid of results altogether? Of course, that would never happen as the men would be outraged to lose this - its such a vital part of amateur sport. So it will remain, with only the women's results being adversely affected, as its only for women that these things don't really matter, eh?