Can't reply to everything written but just wanted to add my little bit...
I was home educated for the later half of my school aged life and I truly believe I wouldn't have half of what I have now if I had stayed in school.
My confidence soared within weeks of leaving school and I can and do work with people of all ages and backgrounds very well. I think I would have found this harder if I had stayed at school and not had the chances I had.
Also re. Educating to high levels - parents do not have to be A* knowledgeable on a subject for their children to attain these grades! Most of my GCSE grades were achieved without my parents telling me the answers to questions so I could memorise facts and pass exams! I had to find answers for myself using resources such as libraries, the internet, a distance tutor etc. and then actually learn the subject.
I achieved an A* in a subject my mother hadn't even heard of 
Re. Dropping out of school/dropping out of work or other 'hard' things. It is a common misconception that HE kids will 'give up' on hard things as they did on school... But it's rubbish. I have worked with job seekers my age in my career and personally I have found a lot of fresh school leavers seriously lacking in motivation, morale etc. which tbh I have never had a problem with myself. I didn't go through the traditional university route after GCSEs, I got a job. Then I worked my way up. I was in management before I was 20 years old and i don't think this should be unusual! a lot of teenagers out there have so much potential and it is sad to see them thinking that the only way to be successful is to a long slog through the education system which is not at all suitable for most people.
Some people do fine at school, some love it, it is the best option for many children and teens. But not all. It is the only option for many and people who can't home educate will defend their choices as much as those who can and do.
I could go on but I won't. I will end by quoting Beatrix Potter
"Thank God my parents didn't send me to school, it would have rubbed off some of the originality"
Night night xx