Not so. I write the books; the publisher does everything else. Perhaps some day I will want to do everything myself. Until then, the publisher and I have a mutually beneficial arrangement.
I see no reason why an author should not be able to sell his copyrights to a publisher. Nor do I see why the copyrights purchased by a publisher should not be protected by law just as if the author had retained them.
I just gave you one. The publisher will suppress uses of content from your books long after you are dead. Maybe the kind of book you write isn’t the sort for which that matters. In the case of Frost’s poetry, it does. Copyright and patent law as currently instituted impedes rather than promotes progress in the sciences and (useful) arts. I’m glad you’re happy with how your publisher treats you.