Occasionally I make a mistake or leave out some detail in an answer or a question. Usually someone will politely point out the error in a comment. Then there may be a little back and forth discussion through more comments. Usually this all results in me making some change to my original post.
After this point, ofttimes none of the comments make sense. Should we clean up after ourselves and delete the comments? What if only one side deletes his or her comments? Then the remaining comments make even less sense.
It's not a big point, I suppose, but I have often wondered about best practices and protocol in this situation.