Our kids are pretty ok with doing things the right way, but they free climb constantly. (And before anyone jumps on my case, we all free climbed when we were kids!)
But when we're hanging out with the OUTCCTT crew, it's so much more fun for them because you can do so much more in the tree.
You can't leap a 15' span without a rope. And you certainly can't appreciate your descent as much when you're scrabbling compared to a nice smooth rappel.