I am reminded of a cartoon I once saw. It showed a businessperson meeting another in a typical office. The caption read "We really liked your resume and would be interested in meeting the person it describes."

Obviously you can select the good engineers a resume describes from the bad engineers a resume describes. What you cannot do from the resume alone is deal with false positives in the form of misrepresentations, nor with false negatives from people who are better at programming than they are at writing resumes.

You already know this, that's why you still have interviews. But I hope you can appreciate that additional information can help you pick out some red flags for the "good" resumes, thing you will want to ask about in an interview, and likewise a resume that doesn't seem all that great but is associated with good work on github.... Maybe that's a false negative and you want to interview them anyways to see if they simply suck at resume-writing.