Yes, it's not entirely without uses to have a third manifesto. There was, for instance, a NoSQL manifesto a few years ago. Relational purists could reasonably point out this is a clear sign of the immaturity of the new technology as they were on their third manifesto nearly two decades previously.
I found some of those purists very annoying. The real world is often messy and organic, and trying to force excessive order on it just makes for confusion and/or silly extra busy-work.
