Doctrine can all too quickly become dogma
Quite correct and the secret is in understanding that doctrine is a foundation from which to proceed, not a set of rules. That assumes that doctrine is written correctly, using the right sources. Think of doctrine as your handover notes that you refer to in the first few weeks of a new job; you then find your feet and take the job to the next step.
Unfortunately, there are too many people who use the above quote as a reason to ignore doctrine. We take a perverse pride in not wanting to follow past learning and then we find ourselves back in Basrah in 2004.