Yes I agree, I don't think this helps us make better decisions about any one child. But I wonder for instance if we might do a lot better at judging schools, a

Yes I agree, I don't think this helps us make better decisions about any one child. But I wonder for instance if we might do a lot better at judging schools, and learning what works. Right now the default position appears to be that the input to schools is uniform and thus that good/bad exam results are a measure of the school. But they aren't. If we become a bit less blank-slate about the children, maybe we can do better at figuring out what kinds of schooling work better or worse. This doesn't directly need genetic tests of anyone, but it does need a change of mindset.