How could trying to make sentences sound good help you do that? The clue to the answer is something I noticed 30 years ago when I was doing the layout for my first book. Sometimes when you're laying out text you have bad luck. For example, you get a section that runs one line longer than the page. I don't know what ordinary typesetters do in this situation, but what I did was rewrite the section to make it a line shorter. You'd expect such an arbitrary constraint to make the writing worse. But I found, to my surprise, that it never did. I always ended up with something I liked better.

I don't think this was because my writing was especially careless. I think if you pointed to a random paragraph in anything written by anyone and told them to make it slightly shorter (or longer), they'd probably be able to come up with something better.