I guess my take on why there aren't so many articles on how to be a Great DBA is that it's a bit of a Catch 22. The Great DBAs are too busy doing and writing about great things and helping others rather than writing about being great. 😀 Brad would be an almost unique exception to that rule.
As a bit of a sidebar, anything after Brad's book would, in fact, be anti-climatic. Chapter 2 of Brad's book is probably the finest and most important take there will ever be on what makes an "Exceptional DBA".
To summarize in a single statement, we have to use what David Poole said many years ago and I quote him regularly... "If you're the first one people seek out for help rather than the last, you're probably an Exceptional DBA".
--Jeff Moden
Change is inevitable... Change for the better is not.