Generally, I think stackexchange sites treat comments as a sticky notes, which is better to be removed if it can be. Reference: How do comments work?
I’m asking this question because I came encountered a comment which I think is “no longer needed” but such flag was declined. Namely, this comment: How do Bitcoin clients find each other?
A comment to indicate the comment-poster is also curious, can be substituted by an action of upvote for the question. If so, I thought such comments are almost always “no longer needed”.
… Or am I missing any view points..?