The previous neighborhood I lived in, had around 100 townhomes, very secluded. I never saw kids outside other than walking from the bus stop. However my current neighborhood, which is a development of 15 houses, 11 of which have children. The kids are almost all doing things outside every day. Caveat: everyone in my neighborhood is college educated (mix of engineers, professors, finance, teachers, doctors, lawyers, and some other stuff) pretty sociable, and we (the parents) all seem to independently be anti smart phone, tv, etc. high school age kids do seem to go outside less, but theyre all 2 or 3 sport kids, and pretty busy academically.
The US (especially the vast bulk of suburbia) is incredibly varied in quantity of these.
Some areas have them. Ironically, for all their faults, Florida master planned developments do better than most, and the west has a surfeit of natural land.
Others are an endless sea of kid-unfriendly private businesses and/or income-gated spaces, locked behind access to an automobile.
At some point the US, especially east coast suburban US, forgot that roaming kids need somewhere to roam...
I think it’s mostly phones, social media etc… My 20 year younger sister grew up in the same house I did with almost zero changes within walking distance.
Her and her friends never played outside. Me and my friends and my brother (7 years younger than me) and my other sister’s (4 years younger younger) friends lived outside in the summer.