As a non-author reviewer, a PR that already has a bunch of the author’s comments and updates* before I even begin my review makes me happy.
*As long as they’ve not simply because the submitter opened the PR before the work was really done. Unfortunately, in my experience, this is more common than one might assume. And, is especially common in “agile” environments where everyone is just trying to close their issues before the end of the sprint/iteration so they don’t carry-over.