I'll throw my hat in the ring....
I see this exact same discussion among stonemasons, specifically those that want to specialize in dry stone walls....to train or not to train. There are a lot of good reasons for training, for one, it's a starting point if someone has never walled or was never taught proper technique. Every student is different, each has circumstances and abilities that are unique to the individual. Some get the training and dogmatically follow what they learned, and never open up to other styles and techniques....they only do what they are taught. They cannot think beyond their training either....looking at other methods as inferior or not true to the style.
Then you have those that take the training and use it like a spring board into a broader scope of work (IMO, a more complete one ) within the craft. And finally you have the group I belong in. The ones that started out working for great craftsmen, worked incessantly on our own to further individual knowledge base...by doing, by learning, by failing and succeeding. I know stonemasons(& masons) that have come from all three situations.
The common denominator? They are all different types of people. So the real issue with stifled creativity is how an individual uses they training they get. The training itself not the problem.