Hormonal replacement therapy makes trans women lose their advantage regarding muscle growth so the only real ‘advantage’ they have to being trans is being taller on average, but cis women can be tall as well and that was never considered unfair. Also trans women have disadvantages because they often have to deal with surgeries meaning they can’t train for months and they face a lot of discrimination which can impact performance, training possibilities and income (which also affects training possibilities and time). Trans women have never been a threat towards women’s sports, the percentage of trans women with medals is less than that of cis women. Even if you remove the factor of discrimination then the advantage trans women have is no more than a cis woman who is born with very slow muscle acidification. Talking about actual unfair advantages, in many olympic sports you have to have rich parents to be able to get on an olympic level because training facilities are expensive and you (and your parents) need to have a lot of free time.