I agree with everything you wrote, but if your company is big enough to have in house recruiters they probably don't want you doing it!
Not because they don't want to be able to hire great candidates efficiently. But because you presumably don't maintain the statistics they need to keep. For example, say (I don't know you and am just making this example up), you might without realizing it only be contacting candidates who have names that you recognize as male, while they want to make sure they are pulling from a wider pool to improve their chances of getting the best candidate They may have other reasons for collecting such statistics (SEC filings? Who knows?).