As a moderator for GD.SE I was always led to believe our role is to clean old comments as they are intended to be a temporary item depending on the level of context and if they add any benefit to an answer. On SO I haven't had any issues or declines when I read old Q&As and see +1 and thanks and flag. 

However, on other sites when I read an old Q&A and I see thanks or +1 I try to be courteous and flag them as I am aware moderators do get measured by their cleanup and I'm accustomed in doing so on SO but these flags are declined. 

So this leads me to ask:

* Should +1 and thanks comments be flagged and is the intended role of a comment still to be considered as temporary?
* What is the proper classification for a thanks or +1 comment if it should be flagged?

I didn't see any Q&As on this topic after browsing the tags: [thanks](/questions/tagged/thanks "show questions tagged 'thanks'") [comment](/questions/tagged/comment "show questions tagged 'comment'") and searching led me to: [what to do if an answer has too many “Thanks!” comments?](https://meta.stackexchange.com/questions/147007/what-to-do-if-an-answer-has-too-many-thanks-comments) but that was several years old.