Centralized notifications is not a "genius solution", it is the "only possible solution" for power-constrained devices, if you think about it. Same thing applies to Android: in ideal world it keeps a single connection open to GCM servers to listen for notifications for ALL apps on the device, and then routes messages to the appropriate applications they are intended for.
I never said centralized notifications is conceptually a genius solution. I said actually building a system that can handle so many billion notifications is impressive. I'm curious how it works internally...
