A full time author has to have several 'ideas' in the works in order to pay the rent. A part time author has a 'day job' and can only work when the rent is paid. Once the book is turned into the publisher, an editor reviews it and then turns it back to the author for revisions. During this time the book's cover art and title are chosen, a process the author has very little influence on. Once the book is turned into the publisher, an editor reviews it and then turns it back to the author for revisions.
Some editors go through their large pile of books faster than others.
The book comes to the author for revisions and they have no more than 4 months to get the book back to the publisher. Somewhere during this time the publisher gets cover art, and chooses a title. An author seldom has control of title or cover art. There are cover artists who actually have the luxury of reading a book before drawing the cover, but mostly they are given just a paragraph describing some special scene. The cover illustration is pretty nice, and might sell more copies, but it gives away a major plot line.