Am editor. Copyeditor, mostly being, but developmental editor and writing coach on occasion. What differentiate editor from other professional am emphasis on helping and teaching. Co-writer, him have own story to tell, own truth to express. Beta-reader, him focus on having best experience. Editor having all skills that co-writer am having, but necessarily on higher level. To teach, must being one step ahead of student. To fix, must seeing past current mess. Editor also having similar focus as beta-reader, but also possessing superior knowledge for articulating problems.
In my time of the 33rd century, editors am not paid. This normal in post-scarcity future where everyone am guaranteed enough woolly mammoths for basic needs. Editors am instead rewarded in intangibles like mebbe life satisfaction, professional renown, and esteem of beautiful women.