I've tried to explain this to someone before, but it doesn't seem to be easy to understand.
I was 1.90m tall, 6'3 ish, when i was 14, i was pretty much done with puberty when i was 16.
Anyone who thinks i wouldn't have an advantage over girls in sports if i transitioned then at 16, at that size, are just straight up wrong.
And to those saying cis women often beat trans in sports, sure, maybe now, but if they are allowed to compete with women, it's just a matter of time before most in the top are trans women.
I want everyone to live a good, safe and happy life, no matter gender, sexuality or colour, but saying i don't think trans women should compete in the women's division, makes me a bigot and transphobe in most discussions online.
As some have pointed out earlier, this is why many don't bother taking part in these discussion.