There exist counterexamples in the broader world. Historically in the Sinosphere it was commonish that two people might share a command of written Classical Chi

There exist counterexamples in the broader world. Historically in the Sinosphere it was commonish that two people might share a command of written Classical Chinese but not really be able to speak to each other. For a modern example, consider the paper below: https://eric.ed.gov/?id=ED515291 https://eric.ed.gov/?id=ED515291