Given how selective Stanford is, and that it does not formally admit by major, it would not be surprising if the admission competition among prospective humanities majors includes those who are academically top end in all aspects, including math, science, and the counselor’s “most demanding” rating.
No one here would suggest that a prospective science or engineering major aiming for Stanford take fewer or less rigorous English and history courses or not care about the “most demanding” rating, so suggesting the analog for a prospective humanities major seems odd (and plays into stereotypes of humanities majors being academically weaker).
Of course, it is a given that top end academics are not sufficient for admission to Stanford. But they are necessary.