I wonder if recruiters recruiting recruits for recruiting are substantially better at it than when the same recruiters recruit for clients -- the way real estate agents tend to be substantially better when selling their own houses vs. for clients, and how doctors tend to make better medical decisions (less painful, better holistic outcomes, less cost) for themselves or family vs. regular patients.
Maybe part of it is that a recruiter should fully understand the role of a recruiter, but very few really understand the developer/devops/etc. roles they recruit for.