Clearly from the replies on here this simply is not the case at all.
There seems to be some very polarised views with a lack of understanding on both sides.
School is never going to be a one size fits all, and children with extra needs tend to fall through the cracks. Home education is likely to be a far better option for them.
One thing that is very clear from this thread is that you need to be comfortably off to be able to educate your children properly. All the extra curriculars will cost, tutors will cost, entering public exams will cost. And if they are taking science GCSEs and A levels they need to pass the practical element of the syllabus as well as the written element, and going to an exam centre to do this isn't cheap either.
Home schooling done well can be the best thing ever for some children, but in many cases it isn't done well. The lack of regulation is a problem, and the naivety of some parents who think that taking GCSes isn't necessary robs the children of future opportunities.
I know of one young man who is teaching himself A levels as he found that college wasn't a good fit for him (his parents suspect he is on the spectrum, but he hasn't been assessed). He is motivated and doing well. He had an expensive week away in another city in order to fulfill the practical requirements of a science A level - cost of the course, cost of the hotel and cost of train fares. He took one A level this summer and achieved a B, which he wouldn't have got if he had stayed in college.
On the other side, I know a parent who just didn't like getting up early and decided to home educate her DD, then home educate the next two when they left nursery. Living rurally there weren't the same socialising opportunities you get in cities, and frinds whose DC attended school noticed how far behind these home schooled DC were getting. The parent decided that home educating wasn't working so she sent her children to school whereupon the teachers noticed immediately that all three DC were dyslexic. The parent didn't have the knowledge to pick up on this.
Those are just a couple of anecdotes of two families to illustrate how it can and can't work.
I didn't home educate DD for many reasons, the main one being I just didn't want to.