> Apple has had the advantage of green field engineering it exactly how they want it to be from the ground up. It's not quite green field on the software side,

> Apple has had the advantage of green field engineering it exactly how they want it to be from the ground up. It's not quite green field on the software side, albeit mostly. Clearly they already have experiencing re-platforming a whole operating system multiple times. The underpinnings of macOS power everything from desktops to smartphones to watches to tablets already all with diverging user interfaces. They had a solid first-party foundation to build the interface they want; Facebook is ultimately a third-party to Android and is having to solve the same Android hardware integration problems as everyone else.