When you sign a book deal with a traditional publisher, you give up your rights 
to your work–and unfortunately that can lead to some drastic changes to your manuscript. The publisher can choose to remove entire sections of your book or reorganize the materials. These changes will typically be sent to you for “approval,” but don’t kid yourself if you think your vote always counts!
This also means that the publisher can change the title of your book, something that happens more often that you might realize. And that new title might be better or worse. In many cases that I’ve seen, the new title has been a lousy choice. And even when the author disagrees, the publisher moves forward with its own agenda.
So if you’re ready to give up control and let the publisher take over, then by all means, go get yourself a book deal!
Oh HELL no! Hahaha. I’d never give a publisher the rights to mess with my words. Self publishing makes more and more sense, as long as you’re willing to do the work.
Since the Publisher helps you in some areas (e.g. the Buisness aspects) he/she naturally can want a favour e.g. exactly such a favour from you. The world is a Give-&-Take place.
I agree with you that officially NO control will be then hovering over the Manuscript, but IF you have written your Book in a hard-to-change & authoritatively & originality-packed & integrated manner…THEN HOW CAN IT BE POSSIBLE?
Even if they change, it CAN’T be to any significant extent (say more than 5%)!