I believe that this question is somewhat in line with this other Meta question about troubleshooting questions in 2023.

While calling out another user who chronically posts “answers” (such as this one) that are clearly comments asking for clarification or additional details the user retorted:

“You never heard of an evolving answer?”

Screenshot below.

This seems to be 100% CYA nonsense; an excuse fabricated to justify incorrect usages of the “answer” posting function. The user in question has over 434,000+ rep and has been a member of this site for 13+ years. I have never heard of the term “evolving answer” used to excuse a comment being posted as an “answer” like this. And checking through official SuperUser page on answering questions I see utterly nothing that references “evolving answers.” I have always understood that an “answer” is an actual answer and that comments are often used to request clarification and such as clearly explained in this official SuperUser explanation of comments

When should I comment?

You should submit a comment if you want to:

• Request clarification from the author;
• Leave constructive criticism that guides the author in improving the post;
• Add relevant but minor or transient information to a post (e.g. a link to a related question, or an alert to the author that the question has been updated).

To me, an “evolving answer” does not exist and this user is simply making things up in an attempt to justify their posting of a comment as an answer.

That said, is there such a thing as “evolving answers” on Super User and perhaps other Stack Exchange sites? If so, can official guidelines please be shared to back up this “evolving answer” concept?