Home-schooling isn't solely positive, it is also associated with worse outcomes in STEM. This is not surprising as most home schoolers don't got enough STEM knowledge to properly teach the subject. The net benefit you tend to see comes when you average all grades, since STEM is a fairly small portion the net is still positive, but you still see a significant decrease in STEM ability in home-schooled kids

https://responsiblehomeschooling.org/the-homeschool-math-gap...