Yeah. Not to mention how much time, effort and money it takes for parents to shuttle kids around to create some semblance of social life. The more difficult it is, the fewer people do it. Growing up in commie blocks, it was impossible to go out the entrance and not bump into some kids playing. You'd go on the balcony and get yelled to come down by some kids outside. We walked alone to school since kindergarten. There were multitudes of small local stores to buy yourself a treat and share it with the other kids. Even the least attentive parents had their kids get socially functional by society. This sort of thing is possible in some places in North America but I think it's the exception rather than the norm.