What happens if I wrote a book - sent around to a few publishers and then personally had a change of heart - perhap it has content which I now disavow.
Shouldn't it be within my right to withhold publication?
Or because I refuse to publish, but the publishers have a copy - I should lose the right to control my own work and the copyright falls and the publisher can just publish freely?
You could establish contracts with publishers outside of copyright, which is how NDAs work today. It's probably a reasonable thing to do anyway, otherwise there's nothing stopping a publisher from telling everyone the plot summary of your newest novel.
It seems the consensus in this thread [if I'm skimming correctly] is most want copyright completely removed.
So in your hypothetical: you write the book and have a change of heart, I'll just copy it verbatim, slap my name on it and now I'm the author.