Outsourcing a subassembly is a capacity decision. Outsourcing the finished product is an organizational one, and it changes what your own team does all day.
When a subassembly is outsourced, your factory still owns the product: final assembly, test, packing and the last look before it ships. When the complete product is outsourced, that last look moves too, and with it a set of habits that were never written down.
The first thing to formalize is what "finished" means. Labelling, serial number ranges, packaging, documentation in the box, firmware version, market conformity marking — all of it becomes a specification instead of a practice. Most box-build friction in the first six months traces back to something that was obvious in-house and invisible on paper.
The second is the test. Your own line may have tested by feel, with an experienced operator catching what a procedure never described. That knowledge has to become a fixture, a limit and a recorded result, or it is simply lost. Writing it down is uncomfortable and it is exactly where the value of an industrialization phase shows up.
The third is the relationship. A box-build partner sees your demand, your quality data and your product roadmap earlier than a component supplier ever would. That is precisely why the IP terms, the confidentiality rules and the reference permissions belong in the agreement before the first pilot, not after the program is running.
— GANI Contract Manufacturing engineering team