Even if efiled, the client copies are a tree-killer.  Most of my clients still get paper copies of their returns.  So now we have more paper and the flow of information is much more difficult to explain to the few clients who actually want to try to understand their tax returns.  But let's face it, most just want to know how much the refund or balance due is.  "Where do I sign" is a distant second place (and best I can tell that's still going to be on the 8879).