Mullae holds two kinds of makers: technicians who have worked metal for decades, and creators who arrived in this alley a few years ago.
The same hands, different training
Ironwork technicians learned their skill through apprentice-style on-site training and repeated labor, and their output serves as parts or structures for the businesses that ordered them. Creators learned through art education or independent experimentation, and their output circulates through exhibition or sale. Both make things by hand, but the grammar of the two kinds of labor differs.
Not lumping them under "craftsmanship"
Describing both under the same "craftsman spirit" sounds pleasant but is inaccurate. A technician's labor serves the practical purpose of industrial parts production, while a creator's work serves the different purpose of expression. Respecting and distinguishing both purposes is how to read this alley accurately.