<<Now all of these children will be on that level, only with overworked parents who never wanted to homeschool in the first place.

I think this is the relevant quote. Homeschooling parents already self-selected as it were. It is a little bit like Linux. You get in knowing it will require some level of effort. People who choose Windows have no time to devote to that kind of learning. I would not feel comfortable mandating Linux for everyone. Some people are just not ready for responsibility.

I was not homeschooled, but my grammar school experience was borderline horrible and did not improve until private HS ( mostly because my peers were all, well, smarter than me ).

I think you have a point, but it goes back to the question about parents' responsibility and their failures as parents. I am not trying to make anyone feel bad, but we need to be able to qualify results somehow.