[microtherion]

As far as I can tell, Microsoft suffered similar problems, with their desktop oriented divisions occasionally holding back the mobile divisions. It's not like Apple never suffers from any organizational dysfunction, but I feel that separating divisions actively incentivizes dysfunction.

macOS and iOS share quite a bit of software, both in the sense of code bases that have overlap on the two platforms, and code bases that need to work together (e.g. for handoff, or features like Apple Watch unlocking a Mac). Not so sure about the hardware situation, but there is at least some sharing going on. And in many cases, the people behind the technology are shared as well.