I would gladly support & campaign for separate categories for transmen and transwomen, if they don't want to compete as their biological sex
However, transwomen are simply cheating if they compete against women
and transmen have no chance of winning a serious competition against men
There is competition at all levels of sport, from the most local village teams - where a lot of women are in with a shot if we train hard - up through town and city events, then regional, national, European, World / Olympics
Several years ago, I took pride in winning a couple of press-up competitions at my gym - I beat the nearest woman by quite a way, but the man who won their category managed 2 x the number I did
That's opportunities at a great variety of levels, all lost if we end up with only men's and transwomen's sports.