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In the current EU4 version, some of the largest urban centres of their respective regions, such as: Beijing, Cairo, Constantinople, Rome, Moscow, London, Gdańsk, Amsterdam, Rome, Frankfurt, Lisboa etc, have the most worthless trade goods (grain,fish); what can make them less productive than a siberian wilderness with a manufactory. Whereas such cities were not only trade hubs, but also imporant production centres of many crafts:
metalworks(chains,candlesticks,goblets,chandeliers ), jewelry, crockery, books, utensils, musical instruments, arts, dices, playing cards, chess, glassware, furniture, medicines(or proto-medicines), fire arms, carriages, etc.
All these products are too insignificant to be represented separately; however, they deserve joint representation, as simply: Craft products. (base price 3.00, 4.50 once global trade is present).
Introduction of this trade good(s) would help to stress importance of urban centres, and make them more feasible for further development, whereas now one just pumps diplo power into the nearest cloth or iron province.