1. There is a whole cottage industry of resume writers. My CV got me mostly where I wanted and then some, but of course the professional "resume reviewers" told me it's awful and I need to pay them $50 to make it noticeable at all.
2. The "importance of results" makes people willing to bend the truth and then resumes start looking very sleazy. I saw CVs of interns from Silicon Valley darling companies who claim in every line how they saved millions of dollars here and there. Hard to believe frankly.
3. And what do those results even give us? If resume A says "Implemented ETL tool that improved customer acquisition 420%" and resume B says "Implemented ETL tool to work with customer data in Java", there is no reason to believe candidate A is at all better than candidate B. Well, they are better at resume writing or hiring resume writers. Or maybe they are good at office politics and were able to put themselves on impactful projects. But will they pass the FizzBuzz?