I suspect that part of the worry aculture around parents being overprotective of kids today (at least in the west and the U.S. in particular) comes from exactly

I suspect that part of the worry aculture around parents being overprotective of kids today (at least in the west and the U.S. in particular) comes from exactly what you mention, a prevalece of single-child homes with no backup so to speak, vs increased worry in general.