Thank you for the opportunity to help you with your question!
Writing is a learned skill. As with most things which are learned there is always more to learn. More knowledge and better understanding of the craft usually produces a better result, but not always. As far as improvement there is no such thing as "true perfection" since each person has a different idea of what is "perfect". Therefor "improvement" is a subjective idea which varies from person to person. Writing can always improve because it will never be perfect.
Revision is almost always a good idea because people rarely write a perfect draft the first time.
Please let me know if you need any clarification. I'm always happy to answer your questions.