Why are comments being removed with no marker left in place?
Exceptions to the marker rule occur when moderators remove duplicate posts, spam, or sometimes, when a comment or post is removed, it has been necessary to delete subsequent messages which refer to explicitly or quote from the original (removed) comment, in order to preserve some notion of conversational thread. In such cases not every deletion will be marked individually, as this then clutters the comments.
Why are comments being removed with no marker left in place?