I think I learned to be self reliant by going out on my own and finding friends to play with. Taught me to be adventurous.
Unfortunately there may be more dangers having your kids play inside at a neighbor’s or friend’s house (or perhaps your own house unsupervised). . .no control on the remotes as well as computer/ipads, etc.
Word!
Hell, I went to the local golf course and picked up wayard mulligans, then sold them to men playing through.
I also learned how to solo hike when we lived in the Redwoods.
To this day, I love walking off into the woods and sometimes not coming back for a few days because I don’t feel like it.