The only way for recruiters to become viable solutions as "middlemen/middlewomen" are to learn about the technical aspects of the roles they are marketing. So

The only way for recruiters to become viable solutions as "middlemen/middlewomen" are to learn about the technical aspects of the roles they are marketing. So often, a good majority of them do not understand what's an ideal candidate profile vs. what's a potential candidate profile look like. This all stems from experience and in my experience, many are lacking in that department at the moment.