[somberi]

A meta critique after reading 139 comments: I too had the same question as the parent and from the ensuing conversations, I assume that either Docker is so thin-layered (not in a bad way) that it is open to so many interpretations or it is so thin-layered (in a trivial way), that one does not need to get all worked up adopting it if one is comfortable in using other VM options out there (like OpenVZ for example).