Wellll... It probably is true that certain children are more inclined toward school than home education, and vice versa.
But I think too much is being made of the notion that you have to wait and see what sort of child you have, as if it were all down to chance and parental preference were fairly irrelevant.
There are a lot of different schools, and it seems likely to me that for nearly any given child there is a school in existence where that child could be happy. There might not be any such school near where he lives, or he might not be able to get a place there, or his parents might not be able to afford it. But if his parents were very keen on sending him to school and were prepared to go to great lengths such as moving house, chances are that they could accommodate him.
By the same token, there are all sorts of different ways to home educate and environments in which to do it. For this reason, I think there are very few children who cannot enjoy home education. Parents who believe in home education can usually find a way to make it a happy experience for their children if they are willing and able to think hard about their child's needs and work at accommodating them. Discussions about how to improve a particular child's experience of HE are frequent in my circle.
So I don't see why home education (or school) shouldn't be Plan A for a given parent or couple. If it doesn't seem to be working, there are things one can try in order to fix the situation. In the end, it may be that the parent does have to resort to Plan B and use an education system which she doesn't really like, having concluded that Plan A is unworkable after all. But I think it is unduly negative to suggest that Teacherandmum shouldn't plan to home educate in the first instance.
Apologies in advance for banging on about this again, but one of my children is the very stereotype of a child who would be suited to school. From an early age she was outgoing and confident. She loved to be around people. She was compliant, bright and interested in academics, and was autumn-born. She was as "ready" for school as any other child in her year group. I think that if anybody would do well at school and enjoy it, she would.
So why didn't I send her? Well, there are just a lot of things I dislike about the school system. And I thought that with the right environment, home education could suit her even better than school, that she would be happier out of school than in. With some luck and some effort on my part (primarily through focusing on her strong social needs), she has had that environment. She has loved home education. Eventually I did encourage her to satisfy her curiosity by trying school when the time was right, after which she chose to return to home education. It's still not impossible she might end up in school later on, but at this stage I have every reason to expect HE can be adapted to meet her changing needs.
This is why I don't really go along with the idea that home education is OK for children like my younger daughter who doesn't fit the school mould, but is wrong for children like my older daughter who could fit into school without too much effort. Even before you've met your child, there's nothing wrong with planning to home educate just because it feels right to you.