When we leave comments, we see this message:
Use comments to ask for more information or suggest improvements. Avoid comments like "+1" or "thanks".
Also, Help Center says:
When Shouldn't I comment?
Comments are not recommended any of the following:
Compliments which do not add new information ("+1, great answer!"); instead, up-vote it and pay it forward;
I saw this comment:
+1. Perfect answer.
I thought that it was just a "+1" or complimentary comment, so flagged it as "too chatty", but it was declined. I want to know why it was declined.