Once upon a time, a certain house acquired one of my manuscripts. Five years later, it was published. In the meantime, not one, not two, but FIVE editors had worked on revising it. On the day of publication, NOT ONE WORD of the original manuscript remained. This was no longer the manuscript I'd submitted and no longer the manuscript I loved. I'll leave it to you to guess how much effort I put into promoting it.Oh, my sympathies. You hear about this happening. And damn it, editors need to be extra sensitive when they've inherited a project that has already seen a bunch of editorial work and revision.
The editor(s) are not always right. It's possible to kill the spirit of the author, in the guise of adding all those walnuts. (walnuts, here, is a reference to my post "Cakes and Critics"--EA)
But also damn it, this is why you, the cook, have to protect your creative work. Do think hard about the comments and suggestions editors offer you. Don't use them if, after that hard thought, you don't believe they will make your book better.