This thread is going to get out of hand pretty quickly. So let me at least try to put some science into it before that happens.
First, the idea that males are
born with an inherent physical advantage over females is categorically false. The advantage is
gained at puberty (testosterone, specifically) which generally results in grown men being taller and stronger than grown women. A transgender girl (assigned male at birth) who never undergoes male puberty will have whatever inherent physical capabilities that any girl born with her genetic makeup would have-- no advantage whatsoever, because she has never experience the effects of testosterone. There are exceptions of course-- there are very strong women, just like there are very strong men. Caster Semenya, the South African (genetic XX) woman is an example-- she had naturally elevated levels of testosterone, but was born female. Many female athletes who are globally elite athletes have this advantage to some degree.
A transgender woman (assigned male at birth) who did go through male puberty but transitioned afterwards, will have an advantage. Some of these advantages are higher strength, stronger bone density, and a larger heart which grants a VO2 max advantage.
@HFCS many truly transgender people have known from birth that something was wrong. I was one of them. I might be misinterpreting your use of the word "concern" earlier, but in my opinion, transgender people are better off when they are allowed to delay puberty so that they can receive the therapy that they need to determine if this is the path that truly need to follow, along with hormones to transition when cleared by their therapists. A transgender person who transitions early in life will look indistinguishable from their cisgender counterparts, and assuming they live a life of stealth (not divulging their transgender status) will not be victims of harassment.