The copy editor's job is to copy edit for several things, not just "accuracy".
You're not putting accuracy ahead of beauty. Rather you seem to be saying that accuracy is all, and beauty is nothing. By beauty I assume you mean "Writing good English". Whatever good means.
And a copy editor is not adding material, you know this. They are changing already existing material. That is not the same at all. The burden for what that material is, is on the shoulders of who added it. Not who re arranges it.
Will Johnson
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