Why is it difficult to determine the exact number of Tibeto-Burman languages?

Determining the exact number of Tibeto-Burman languages is impossible due to several complex factors:

• Linguistic Ambiguity: There is no clear, universally accepted distinction between what constitutes a distinct language and what should be classified as a dialect.
• Nomenclature Confusion: There is a profusion of names for the same linguistic entities. Many of the more than 1,400 recorded names are simply multiple designations for a single language, including autonyms, exonyms, paleonyms, and neonyms. Furthermore, names are often conflated with those of ethnic groups.
• Naming Conventions: Language names are frequently used in both narrow and broad senses, sometimes referring to a specific language and other times to an entire group of related languages. Additionally, smaller or vulnerable groups may adopt the name of a more prestigious neighbor.
• Discovery and Documentation: A number of languages remain to be discovered or described, and political or geographic barriers have historically limited access for field researchers.

While scholars estimate there are approximately 250–300 languages in the family, these factors make a precise count elusive.1