Whether we like it or not, English is the defacto "business" language. Most (if not all) places in the world conduct business in their native languages(s) and E

Whether we like it or not, English is the defacto "business" language. Most (if not all) places in the world conduct business in their native languages(s) and English. So why would I want to learn Mandarin, which I've been told is super hard to learn and is for most purposes, useless elsewhere in the world?