Before revision:  Practice and recent evidence suggests that the state-of-the-art (SotA) ASRs struggle with speech variance due to gender, age, speech impairment, race, and accents.
After revision:  Practice and recent evidence suggests that the state-of-the-art (SotA) ASRs struggle with the large variation in speech due to e.g., gender, age, speech impairment, race, and accents.