That's just the justification they give for their existence. You neither need not count on someone who wrote a thesis on 'feminist perspective of aztek dance' or some nonsense like that.
The only reason humanities departments are this big today is because of the biological waste who can't make it to STEM or any other useful profession. If we limit humanities to classicists, linguists etc... whose work is actually rigorous and not just peddling political nonsense, humanities would not have such a bad rap.