Not really. There is deep knowledge and capacity in doing the hardware design. It's not as if Apple sends over a couple powerpoint slides with some renderings

Not really. There is deep knowledge and capacity in doing the hardware design. It's not as if Apple sends over a couple powerpoint slides with some renderings and then Foxconn delivers a product a year later. Apple delivers highly detailed designs, exact geometry and tolerance of each and every part, all the process documentation, specs, materials, designs for how the assembly line should be, etc. All that gets handed to Foxconn and they manage the staffing and feeding of the lines.