Every writer needs an editor because that second set of eyes will invariably identify something that the writer missed. Sometimes it's just a simple typo; maybe a dropped apostrophe (or an extraneous one). Perhaps the writer left out a critical step, thinking everyone knows about that. I've heard editors described as professional idiots, paid to misunderstand everything and then modify it so that it cannot be misunderstood.
That's a lofty goal, but a worthy one.
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