What is the best existing evidence for unschooling?
To me it seems based on the premise that children, when left alone, become automatically strategic. Which is not a new idea; J.J.Rousseau already made this popular centuries ago (and provided some fictional evidence).
Here is an alternative hypothesis: Children outside of (elementary, high) school do on average significantly worse than their peers in schools, ceteris paribus. But there are also other factors beyond school contributing to education, which means that an intelligent child of educated parents who invest a lot of time and expose the child to their values can get better results by unschooling than an average child of average parents with average attention from parents gets by school.
Apples to oranges. The relevant questions are:
1) Does an intelligent child of educated parents who invest a lot of time and expose the child to their values get better results by unschooling than an intelligent child of educated parents who invest a lot of time and expose the child to their values gets by school?
2) Does an average child of average parents with average attention from their parents get better results by unschooling than an an average child of average parents with average attention from parents gets by school?
The answers to these two questions are not necessarily the same.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.