I'm pretty sure some places do have weight divisions for football. I know for certain that one of my wife's cousins had to change to a different nominally-age-b

I'm pretty sure some places do have weight divisions for football. I know for certain that one of my wife's cousins had to change to a different nominally-age-based division because he was simply too big for the division he was in. So the fact that these are team sports doesn't completely preclude weight-based or height-based partitioning.