"I'm sorry to have to say this, but it is coming across a bit as if you have an axe to grind and it's not really going to matter what I say, you're just going to jump in with 'well, that wasn't the case for me' and ignore the fact that it might be the case for most people. Maybe it isn't intentional but you are coming across like that a bit."
I am sorry if that is how I come across bumbleymummy. What I am trying to say is, every individual has to be treated as a new case to some extent, with all possibilities open. No one individual is "most people".
Statistics work like that. When I toss the coin there is a 50% chance it will come down heads. But the fact that it came down tails last down does not mean I can predict that it will come down heads this time. Statistics work for populations, not for individuals.
When dh came down with Reyes syndrome his GP had never seen a case before. Statistically, it was very unlikely. But it still needed treating for what it was: a firm understanding of the statistic unlikeliness would not have saved dh's life.
Statistically, it is unlikely that a woman PowerOf3 encounters in her antenatal classes will have had 80% of her breast tissue removed, but I bet Bogeyface's antenatal teacher wished she had been open to the possibility. Because by definition, the statistically unlikely will sometimes happen- and if you hadn't allowed for it you may make a prat of yourself. Or do real harm to the self esteem of some vulnerable woman you are supposed to be supporting.