Men who weigh 100kg are also banned from participating in the 63kg weightlifting category. So what? There are physical traits that offer advantages in sports. We bucketize so that we see more interesting competitions (aka a 120kg weightlifter would completely dominate all of the smaller folks, every single time, so what's the point of competing ).
I don’t see where we disagree. It is exactly why we have different buckets for men and women. Otherwise why would ever a woman try to compete in weightlifting?