Obviously this won’t work for all sports, but things like football, track, soccer, it would allow for de-gendered team, even allowing athletes with the skills but not the genetically-endowed physical attributes to have a place to play.
Note: I know very little about sports and being on a sports team, so please point out anything that doesn’t make sense.
At a minimum men are born with more muscle fibres and process energy a little more effectively. Puberty is not a factor.
If we could wave a magic wand and make transitions change the multitude of differences it’d be great but the science isn’t there yet. We’re left with reality.
Weight classes won’t cut it unfortunately.
Lean muscle per kg of body weight is significantly higher for men.