Not from my experience. The kids on my block played all summer long on bikes, with hoses, and at the nearby park. I'm guessing from 5 or 6 different houses on the street, all different ages. Just kids being summer kids.
Same story when I visited family in Colorado. Just kids playing outside like kids. Coming over unsupervised to play with the kids.
Seems like I might not live in the areas where the sky is falling, but I see kids reading outside, playing outside, and generally being away from their parents all the time in my own neighborhood
Kids running free from house to house and playing on their own. Is that really so rare outside of some of the big cities?