I hear you, MJ. After a decade helping plug the holes in the public education sector I'm more than a little jaded about it's overall effectiveness. For starters, of necessity, it must teach to the median, which means everyone gets a mediocre education. The best education I got was in the private sector for my final 2 years. I was in the elite classes for history & English ~ just 5 students & we were operating @ a uni level.
What I do know is homeschoolers have been outperforming public school students in America for decades & it is fairly well documented. The same was happening in Australia when we were finishing up but documentation was only just starting to happen.
S.A may have a better system in place than Qld. N.S.W. certainly has. The older, more experienced teachers are far better educated themselves than their younger counterparts. I was appalled @ some teachers lack of general knowledge. So while I understand where you're coming from I cannot agree. I hope I have said that respectfully. It is meant respectfully.