I don’t think it’s really Apple’s MO to outsource product design to any significant extent, though they do use a lot of contract manufacturing, my understanding is that they dictate how a lot of that’s done. Their brand is all about quality and seamless integration between everything, you don’t get that without being involved in every aspect.

They won't outsource design, but they can outsource the engineering needed to make that design safe. Its not like the "boutique car from a consumer electronics" market is saturated, they can take more risks in regards to info leaking.