What other good or industries would benefit from the VenetianBravosi arsenal style system? I can’t envision an effective way for a production line to each make just one part of a sword of piece of armor

Any industry where you have items made of different parts. Based on the history of technology, I would point to texiles and associated trades as an early adopter, fine machine goods (all those Myrish crossbows and telescopes and the like), pottery (the Zhou dynasty, for example, had assembly lines with division of labor and centralized inspection for quality, which allowed for the mass production of pottery), etc.