An internet definition of perfection: “the quality or condition of being perfect. The act or process of perfecting.”
The question seems relative, depends on personal preference, experience, the tools at hand, and on the intended application. As an index to achieving PP “perfection” it really can depend on the PP programs available to the photographer. One may view an image as perfection and another sees it as trash. So it varies person to person. Perfection dependent image correction. (👀 just Joking ). No one size fits all. The perfection index therefore goes from “it needs PP” to “not there yet”, to it’s perfect”! I think 🤔