You are making the presumption that a modern parent would permit their child to go outside and play without going with them. The primary reason most kids don't want to play outside is because their parent goes with them and kills every single opportunity for fun.
> parent goes with them and kills every single opportunity for fun
Sad but true. I'm super self-conscious of dancing because when I was little my mom would always chaperone these events and watch me. Now I always feel like there's somebody standing around with nothing better to do but analyze my every move, judging who I'm talking to, saying, etc. When my friends come over I hate even talking to them in the house because I know she's listening. Same thing with phone calls in the house. I always need to go for a walk for that.
I would love to do this, but cannot in my location. Both because it would be too easy to step into fast moving traffic (age specific issue), and because people have been known to have CPS called on them for letting their child play unattended.