> - "Prefer New" seems almost useless. You've already spent all this effort doing the job, why are you cancelling it and throwing away the results?

The obvious use-case is if the result depends on a state and the state has changed since the job has started. Examples would be updating the landing page when a new article has come in (you don't need the outdated landing page w/o the new article) or if you did a code change while compiling (assuming it's not a commit).