To answer the OPs question it is this...
Home Ed is absolutely the right thing for particular children. In fact it's the best.
However, the vast majority on here are responsible, educated, engaged parents that want the best for their kids in their unique circumstances... and provide it. They go into it with thought and research. Socialisation is not an issue because they set up networks that feed into the best results they can get. I have met many home Ed kids who are fabulous, switched on, bright beyond their years and easily switch to sixth form/uni because of the work their amazing (mainly) mothers have achieved.....
But but but... there is a HUGE but.
I work in the field of modern slavery (fancy word for exploitation) .. the LACK of regulation is not just worrying but a massive issue.
If I were allowed I could give you horror stories that run from drunk abusive parents who simply can't be arsed to get up in the morning, to those that punt their kids out for cleaning, housemaid services and sexual abuse... with NO CHECKS ...
THAT is the issue. Not the 97% who are doing the right thing for their kids but the 3% who aren't,,, (3% is a LOT of kids btw)