content: This would be a negative if it wasn't for the fact that macOS and iOS are both based on the same underlying operating system. There's no reason to have a dedicated Mac operating system team because they're all working on the same code base, Darwin. There will be sub groups built around the different UIs running on top of the base OS of course. It makes much more sense from a software development point of view to have developers ensuring that their code runs on all the various bits of hardware rather than each team forking it constantly.