Apple has only very recently begun to adopt open offices -- meaning in 2016. At the time the iPhone was created and soared to market dominance Apple workers were in actual offices with locks due in part to Apple's obsession with secrecy ( 1 or 2 to an office ).

At least so far as Apple has adopted the open office craze, innovation and sales have dropped with Tim Cook taking a recent pay cut for poor performance.

Yes, Apple is moving to open offices in the new Cupertino headquarters, the "spaceship," but that is not how they achieved their big success with the iPhone.