I was reading another thread and I really don't understand what's being said in the +5 upvoted answer here, where the user explains that "comments are ephemeral":
The user "Yahoo Answers enthusiast" speaks of himself at the third-person (I can already see some more of this in the comments/answers here but that's not the point):
...you'll soon understand why no one really cares about comments, they are pure noise. And let's not forget that comments are ephemeral... I know of at least one moderator who absolutely hates them and misses no opportunity to delete them.
And I don't get this: does it mean that mods on SO can delete comments at will, simply because they do not like the very idea of someone writing a comment? If that's the case, shouldn't the very ability of leaving a comment be simply deleted from SO?
It's an honest question: I've received very good comments to questions I've asked, like explanation about the side-effects of certain Clojure constructs vs the side-effect-free of other constructs. I've also read a lot of very informative comments from questions I didn't ask.
Meanwhile, what should be done with either:
informative comments if comments are indeed ephemeral and can be deleted at will by any mod? (should these comments be merged into an answer before a mod flips tail or heads or the inverse and hence decide because it's raining or not to delete to maybe or not delete the comment?)
a mod deleting comment just because he thinks comments are ephemeral and can be deleted simply because he doesn't like them?
tl;dr: are comments ephemeral or not and if they are what steps needs to be done to protect informative comments?