That's not the reason. I grew up in the 1970s in a neighborhood where there were usually several different roving packs of kids playing in a variety of ways for

That's not the reason. I grew up in the 1970s in a neighborhood where there were usually several different roving packs of kids playing in a variety of ways for hours on end, after school and all day on weekends and holidays. Thinking back on it, I estimate 75% of the Moms had jobs, and the Moms who didn't were rarely seen anyway. In other words, there were usually no parents supervising anything in my neighborhood in the 70s, yet our play culture was dramatically different from present day play culture.