Ok, haha–let’s say minimal aesthetic considerations. They obviously used the materials available at the time–which reflected some design considerations of the era. My father was an EE/audio engineer working in product design, so I have a good idea on how companies made decisions on products like these, and I guarantee it was an engineer picking stuff out of a catalog, or the general stock of the company that met the overall design requirements of the product at a given price.
I always noticed the difference between a lot of the manufactured products and the architecture of the city–where conceptual and aesthetic considerations were front and center. You can also contrast a lot of Chicago-manufactured products with similar products manufactured elsewhere–and notice the differences in industrial design. It’s certainly not 100% across the board, but it’s consistent theme.