Why Conclusions Are Unnecessary

I understand why introductions are necessary.  If we just launch into a discussion on something without telling the reader what's going on and what we're arguing for, nothing will make sense and our point will not be understood.  Conclusions, on the other hand, don't add anything new.  They restate already given information and usually tie together ideas that should have been already tied together by paragraphing and in-text transitions.  Ending sentences like "Conclusions are really a waste of space and time" are nice, but they don't deserve their own paragraph.