Being able to make an industry with just the bare components of the industry such as the enchanting table for the Arcanum or the pens and input output chest for the barn would allow for much easier placing of industries in places that the large pre-built building wouldn't allow. For example if a player wanted to place an Arcanum underground instead of requiring to remove a large space or have a large chunk of area carved out due to the pre-built buidling they would be able to simply use the system to place the enchanting table that would have all the same abilities.