What primary benefit has William Labov's research on spoken English varieties provided?

William Labov's research on spoken English varieties primarily highlights the linguistic diversity present in English and emphasizes the validity of different dialects, including nonstandard ones. His work played a significant role in reducing the stigma often associated with speaking a nonstandard dialect. By demonstrating that all dialects have systematic structures and are worthy of study and respect, Labov's findings support a more inclusive view of language. This recognition helps learners and speakers of nonstandard dialects feel validated in their linguistic choices and encourages a more equitable approach to language use in educational and social contexts. This aligns with more recent educational practices that aim to appreciate and incorporate various dialects in teaching while promoting linguistic equity.