It’s useful to know someone who can catch a typo, correct grammar, and identify formatting errors. Polishing is important, and it takes a certain set of skills.

But someone who can say, “It would resonate with more clarity if you put this part first, and saved that part for later,” or “Based on your audience, I think what you’re really trying to say is this,” ...

That kind of editing advice is much more valuable, and much harder to find.

Most writing epiphanies come from thoughtful rearranging, insightful questions, and empathetic consideration — not from the addition of a period or the removal of a comma.