East Asian IQ: Cavalli-Sforza hypothesized in The Great Human Diasporas that East Asians have high IQs scores because: 1) parents push their children more in academics; and 2) the children have to learn Chinese characters which boosts performance on IQ tests.
We can test the idea by comparing the IQs of East Asians in their own countries with children educated in an English-speaking country. We would expect Asian parents to encourage their kids in both kinds of countries, but we wouldn't expect Asian children to be mastering Chinese characters in English-speaking schools in Western countries.
According to the averages of several studies summarized by Richard Lynn in IQ and Global Inequality, people in China and Japan average IQs of 105; the mean is 106 in South Korea. The first study I found on Asian IQ was an Australian study (Justine Dandy and Ted Nettlebeck. Educational Psychology, Vol. 22, No. 3, 2002. The Relationship Between IQ, Homework,Aspirations and Academic Achievement for Chinese, Vietnamese and Anglo-Celtic Australian School Children.) Chinese Australians had a mean IQ between 108 and 109.
Now one would expect immigrants to have IQs higher than the average in their mother countries, but we would also expect to see regression toward the mean among their children. I don't see evidence here that failing to learn Chinese characters is hurting anyone.