Can you cite an example of an editor changing a writer's work without the author wanting them to?
Yes, I can. The train wreck I mentioned earlier.
In 1989 I created a "line" of computer books for a small publisher. The line was identified by the books' titles. Think "for dummies," but that wasn't it.
Over the years, the imprint was sold and resold. I wrote several books for the line, and the publishers had other authors write for the line on other subjects.
And, the line's name not being trademarked, other publishers released books under the same titles. A good friend of mine wrote several of them.
I provide all this backstory because...well, because I can.
One of my most successful books, about computer programming, was in its 5th edition, and I was under contract to write a 6th, which I was in the process of doing.
When I submitted the final manuscript, the editor told me that the publisher had decided to change the format of the line's books to something less textual and more visually oriented. I spent a good bit of time with the format and told them that it wouldn't work. It might be okay for applications user's books, but not for a programming language book.
She told me the decision was final. I told her that I had met my contractual obligation and did not care to reformat a completed work, particularly given that the new format was hopeless.
The publisher hired someone to do the reformatting against my wishes. I couldn't prevent it because the contract gave them that privilege. I could not believe they were doing it. The editor was not happy with the decision, either. But the "powers that were" had more votes than she had.
The book was a disaster. It was not well-reviewed. It did not sell well. I might own the only copies that weren't thrown away. When the edition had run its short course, the imprint had been sold yet again, the editor had moved to the new publisher, and she contracted with me for a 7th edition and gave me full control over the format.
The 7th edition suffered from the reputation that the title had earned from the 6th, and its reviews reflected that. It has sold reasonably well since then, and now that I have the rights reverted, it's now my best e-book seller.
I don't claim, nor do I believe this story to be typical. But it has happened.