How does the lack of written records affect the study of Afro-Asiatic languages?

The lack of written records for the vast majority of Afro-Asiatic languages significantly complicates the application of comparative linguistics to the phylum. Because most of these languages are living tongues without historical documentation, linguists lack the necessary data to track the evolution of phonologies, vocabularies, and grammars over time.1

This absence of written evidence creates several specific challenges:

• Relative Chronology: Without historical texts, it is difficult to determine how languages have changed over the millennia, making it harder to reconstruct the ancestral Proto-Afro-Asiatic language.1
• Vowel Omission: Even when written records exist for some branches, such as Semitic languages or Egyptian, they often do not indicate vowels. This omission hinders the accurate reconstruction of vocabulary and grammatical structures.1
• Analytical Bias: The reliance on the few well-documented branches—specifically the relatively homogeneous Semitic family—has led some scholars to incorrectly project a "Semitic type" onto the entire phylum, a theory often contradicted by data from other African Afro-Asiatic languages.1