Xenia, I think what people are objecting to is your assumption that those schools would be the first choice of everybody whose child was capable of getting in and who could afford the fees. That is simply not the case.
We turned down City of London and South Hampstead for dd1 at 11+, both of which have similar outlook and ethos to the schools you are describing. We also decided against Latymer and Henrietta Barnett, which are similar except you pay no fees. We also looked round Habs and NLCS, which are theoretically commutable from central London. Personally, and for my child, I wasn't keen on the elitist atmosphere and the sense of signing your child up for a high-powered but rather impersonal academic machine.
Dd1 is at a smaller Catholic girls' school with a rather wider intake, though still academically selective. Yes, overall the other schools might have slightly better results, though they are more selective, so better results overall don't necessarily mean better teaching or a better outcome for the individual. And yes, they undoubtedly have glitzier facilities and a wider range of out of school activities. But she is blissfully happy, and we are all completely convinced it was the right choice for her.
I think if you tried to sound less sure that everybody would make the same decisions as you if only they would see things your way, people might be less inclined to get huffy at your posts.