Why the marks belong inside the editor
A verification report tells you what happened. An editor tells you what to do next. Highlighting inside the writing surface removes the step where you read a list of findings, scroll back through your draft, find the sentence and remember which term was flagged. The flag sits where the sentence sits, so the edit is one gesture.
This matters most for the tells that hide at sentence level: a hedge stacked on a qualifier, an announcement connective that carries no meaning, an absolute claim nobody can support. Those are not vocabulary errors you can find with a find-and-replace pass. They are shapes, and a shape is easiest to see while you are rewriting it.