I am really not certain whether recruiters genuinely see their job as filtering rather than sorting, or whether it's a façade. Since you cannot generally hire

I am really not certain whether recruiters genuinely see their job as filtering rather than sorting, or whether it's a façade. Since you cannot generally hire the same people for full time positions as the next recruiter, how can you believe you have general advice on choosing the best? You have to reject most people regardless of merit, yet most people will be hired elsewhere. By definition the criteria they need to meet, and do meet, will not be yours.