While the two titles often are the same role in many environments, in many circles the title Editor has been co-opted to mean Writer. Magazine and newspaper owners are known for this. The two roles should function differently.
Experienced writers know that the least ideal person to review a document is the original writer. Another person should fill that role, often called an editor.
Traditionally people with titles of editor are experienced writers and understand the local work flow.
The editor, which in a peer review process might include other writers, should be looking at typos, grammar, adherence to the style guide, administrative requirements, watching for appropriate use of notes, cautions, warnings, etc. In any environment the editor should be a person looking for discrepancies.
Sincere writers should not be upset about the editing and review process. The final professional goal is usable content, to which all team members are striving to achieve.