I played most of my sport through school and they only let you play one per semester, so I just played what I was best at.
They can play both but usually have to pick which gets more of your attention once you grow a bit older. It's just that they seem to be more passionate about one over the other. Between the silly school workload they receive in public schools and rugby training, they barely have time to play another sport even as a leisure activity.
Looking forward to this comp, definitely think we have a top of the line squad may very much be favorites.
Think Heef ran the numbers on this, we were ranked about 4th, but there wasn't a huge gap from 2nd to 4th. Hunts was first IIRC.