What I want to know is, why isn't "Wiki maintainer"/"Librarian" an accepted job category, and why don't companies hire dedicated individuals and teams to do it?

What I want to know is, why isn't "Wiki maintainer"/"Librarian" an accepted job category, and why don't companies hire dedicated individuals and teams to do it? I think that would have a decent ROI, but we probably need someone in the industry to prove the concept, à la Google and SREs.