SOCIOLINGUISTICS
Officially all other Sinitic languages are labeled "dialects" in China. In formal settings, writing in anything other than Mandarin is frowned upon. So all literate folks are taught to read/write text in Mandarin grammar, even if it means pronouncing the written text in their own languages or code-switching between the two. This explains why "writing" between speakers of different Sinitic language users seem to work. (13/13)