It’s surely not just (or even mostly) a moral decision but a practical one too. Superhumans that dominate mere-humans would make that sport de facto superhuman-

It’s surely not just (or even mostly) a moral decision but a practical one too. Superhumans that dominate mere-humans would make that sport de facto superhuman-only, so if mere-humans want to enjoy competitive sport (and we do!) we’d organize a league of our own. Pretty much exactly what happens with sex and weight categories today.