FiddleDiddleDiddle: good teachers are exceptionally good at persuading a mixed ability class of 30 children to be more-or-less on task, undisruptive etc. I respect and admire what they do. Trained teachers learn a huge amount about crowd control and persuading children to be learning on their agenda in a manner that makes the classroom a safe environment.
But those skills that good teachers have don't translate to educating your own children. Really, there's no comparison. Trained teachers who home ed very often say that the first thing they had to do was stop thinking with their teacher hat on.
You might be interested in Paula Rothermel's PhD research at the university of Durham. Against all expectation, what she found was that educational outcomes for home educated children were much better than for their schooled peers, and that the differential was much higher for children whose parents had themselves received minimal education. I know that doesn't fit our nice middle class assumptions about highly educated people being the best placed to impart knowledge and understanding to their children, but that's what she found.
Yes, home educated children don't get the same social opportunities as school educated children. They are different opportunities. Better/worse/whatever.
Many home educating families don't follow a curriculum, let alone the NC. It can indeed make it very hard when HE'ed children try to reintegrate into school - because they know all sorts of other stuff, and have gaps where most children their age don't have gaps. I don't think this means we should all follow the NC just in case we decide we need to use schools at some point, if the NC isn't in the best interests of our children (Which it isn't likely to be, since what we can offer so easily is a truly personalised education according to the age, ability, aptitude and any SEN of our children).
And yes, home educated children can suffer going into school later. Children who didn't do nursery can equally find the transition into school hard. school is a unique culture. I think the important thing is to do what is right for the child and for the family now, and deal with the challenges that life throws at us as it throws them. I wouldn't advocate putting a child in nursery just so they'll be ready for primary school, and into primary school so they'll be ready for secondary. What a way to wish a life away, if nursery/primary/secondary isn't the optimal environment for the child in question.
I think it's worth reminding posters that many many home educated children have special needs of one kind or another. School is hell for many children on the autistic spectrum in particular. In the end, many of their parents stop fighting for the provision their child needs within state education, and start to provide an education themselves, that will suit that child. If/when those children go back into school, shock horror, they still have autism/OCD/deafness/other challenges, and posters on internet threads can still say that the difference between them and other children is "painfully obvious". Do you think their parents haven't lived with that "painfully obvious" since the child was a year or two old? Being in school from 4 wouldn't make any difference to that.