Since everyone else is giving their opinion, I'll go ahead and state that I currently support the Open and Female sports division structure in a perfect world. There will still be issues defining requirements for the female division because biological sex isn't black and white like some people want to believe, and it will still feel unfair to some people. It's just that right now I think it's the best solution. Trans girls and boys would be eligible for the open division. The fact that they wouldn't be as competitive there doesn't sway me because they'd be like the million cisgender males who get cut from teams during tryouts every year.
What does sway me is that people are assholes and trans people would be even more ridiculed than they are now, so it's not a perfect world and the whole situation is shitty, the shittiest part being the imbeciles who don't actually give a shit but are told it's a crisis by idiots on TV.