There are times we need help interpreting an article, but we need to be able to reference them for many reasons.
If one is in this field it is better to know your code to back up many of the misgivings people have about things and the fact that it is the LAW once it is adopted by our state. It is also helpful to know the why of things being in the code also.
We have a local instructor that some people complain about him getting off on tangents, but after MANY years in the trade and being the chief EI for a large city he has great knowledge as to the whys. This comes in very handy when trying to explain things to customers, apprentices and less knowledgeable co-workers that it is not just another stupid code rule.