Excerpt from change request document:
Based on first-hand experience by SIL researchers, Naxi (Naxi Proper) and Narua (Mosuo) are almost completely unintelligible with previously unexposed speakers only being able to understand isolated words of the other's speech.
Both languages are considered "dialects" of the same language (called Naxi) by most Chinese linguists, and most speakers are included in the official nationality group called Naxi, though Sichuan province speakers of Narua are classed within the Mongolian nationality. However, in Chinese linguistics it is common to call closely related languages whose speakers share the same nationality classification "dialects" of the same language even when mutual intelligibility is very low or non-existent. The separate identities of the Naxi and the Na/Mosuo peoples are well-known and documented in Chinese anthropological circles. There is no common literature or orthography in use between the Naxi and Narua speakers.