I wish that were the case, I fully support School Choice, and a Voucher system that will put the money in the hands of parents to make the choice best for their child instead of only having school choice be an option for the wealthy
The context in which i met them was great, and their parent had to be involved to put them there, so i guess i received the "best" examples of homschooled kids in my area, but they did not have any major issue (often missing some in STEM knowledge, but all of them with a logical/creative mind that make learning hisghschool math a breeze, and anyway, our association was there for this exact issue)
Unlike many here I am not opposed to capitalism
For example by giving undeservedly high grades that upper-middle class seemingly happily accept to get their kids into high-status high education. These grades then conveniently becomes part of their marketing.
An even more sinister example is their willingness to actively segregate their schools to have "easy", as in cheap, students that don't require as much resources (like actual teachers) as people - on average - from less privileged backgrounds.
School programs ARE flawed, whether it's science (even math course are!) or non-science. This is a trade-off, accuracy losses against information speed and time spent in problem resolution.
I've heard two years ago that the US is becoming a bit too grade-centric and that problem resolution is not a valued skills anymore pre-college, due to decisions in the ministry under Bush-Clinton-Bush administrations, but my point is valid for most of europe