DVCS and good merges

While it may be true that a DVCS (i.e. multiple repositories) implies good support for branching and merging else the DVCS would be a nightmare to use, it's incorrect to logically conclude that good support for branching and merging implies that someone must be using a DVCS (A -> B does not mean B -> A). Decentralization or support for multiple repositories is a different question than whether the version control system has "dumb" merging. The benefits of easier collaboration (we can pull and push work-in-progress to each other without committing to the "canonical" repo) and offline work are more honest justifications for DVCS than mere good merges.