Frequent updates, continuous integration the real goal
Author Mark Thiele has hit upon the key aspects of waterfall development that DevOps is meant to counteract. Commenter Mark Sitkowski is probably right in saying waterfall isn't always as bad as the example cited. But in general, a more rapid development/more frequent update process must displace today's existing software production processes, even when they work. The problem isn't just getting the project done but getting the application changes into production when they're needed. Most companies have found it to be a major culture change.