It seems that tokenadult believes there's a mimicable or replicable non-genetic factor, and you believe there's a genetic or otherwise 'unique' factor that indicates a gap that can't be closed. It's probably some combination of the two, but it'd be nice if we could talk about that instead of this other stuff.
I made no argument as to whether that factor is genetics, tiger mothers, Kumon, etc.
If you don't give a wheelchair to someone who can't walk, of course they can't get around...
Since Singaporean schools have a student body that is roughly 100% Asian, we have no data on whether or not they perform that trick.
A different straw argument - we don't send dogs to preschool, we send them to obedience school, because we recognize certain things need to be different to achieve the same goal - not biting or urinating on everything.
edit: I'm realizing this might just be about effort/actions vs. results. I'm decidedly on the side that results are what we need to compare.
The US has some 'great' public schools, and some 'terrible' ones. But, the difference has a lot more to do with the students than people are comfortable admitting. The private / public gap in education is also a lot less than you might expect.