I think it goes beyond the brand into the organization of Apple itself. We've seen in real-time how hard it is to build the whole stack of hardware, software and services that work together. Look at Microsoft's, Facebook's, Amazon's, and Google's failed entry into hardware. And look at Samsung's failed entry into software and services.
I don't think it's a coincidence that, as Tim Cook says, only Apple can do this. It's Apple's unique organization and culture that was the best and most important thing that Steve Jobs created, as Tim Cook said in a recent interview. It's a systematic structure for innovation (innovation is hard to do, whereas mere novelty is quite easy to do). That's Apple's moat.
(Whether the above is actually true or not, I believe that's close to Apple's internal narrative as to what its moat is.)
With the recent round of hires we'll see how well this structure can take in new kinds of inputs (culture leaders, creative personalities, etc.) and convert them into product innovation.