Why does the country prohibit abacus mental arithmetic?

abacus mental arithmetic is not prohibited by the state. According to official website, China Abacus Mental Arithmetic Association, abacus mental arithmetic is a traditional arithmetic method, which can cultivate children's arithmetic ability and attention to some extent by using abacus to calculate. Abacus mental arithmetic is widely used and popularized in some areas and educational institutions, especially in specific educational environments, such as abacus mental arithmetic training institutions and special education schools. China Abacus Mental Arithmetic Association was established in October 1979. It is a national, academic and non-profit social organization voluntarily formed by various abacus mental arithmetic associations and institutions. The competent business unit is the Ministry of Finance, registered in the Ministry of Civil Affairs, and it is a national first-class social organization.