But MillyR, non-formal learning doesn't have to be focussed around play and social skills. I'd say there is far higher tolerance of shy people in Sweden (not a nation noted for its social skills) and they still manage to keep their children busy and happy during long years of nursery.
Nature trips, cookery lessons, woodwork, pottery, painting and other crafts don't depend on social skills at all. You can sit and do them in a corner.
Besides, just because all children are not made to learn to read and write, doesn't mean that noone is to be allowed to do it. Why couldn't we have a system where reading is one optional fun activity until the age of 6 or so, but other activities are viewed as equally important from an educational perspective.
Besides, I don't get why children can't learn a wider vocabulary from having stories told to them or read aloud to them by the teacher though. My Swedish primary teachers were very good storytellers; I learnt a lot from them. I still read aloud to my 13yo, despite the fact that she is capable of reading Thackeray and Dickens on her own- I think reading aloud is a great educational resource. And the skill to listen is a valuable preparation for university studies; something children are missing out on these days.
The problem is, I suspect it wouldn't work here, because children would be told by their parents that only reading and writing is proper learning; that what you learn from being told stories and making things with your hands is inferior and boring. I don't personally get this: painting was good enought for Rembrandt and listening to stories being read aloud was what adults did right up until the coming of television.