You're essentially suggesting that Android should have Tor built in. The point is that it's possible to use other push services on Android and has been done, just like it is possible to use Tor on Android. There is no reason that AOSP itself needs to implement Tor any more than Windows or AOSP needs to provide a push API. Both are possible to implement on top of the platform and have been implemented on top of the platform.
This is unlike iOS, which is the real broken platform.
Push messaging is a service, just like anonymous proxies are a service. It doesn't make sense to put them into a platform if they can be built on top of the platform. It would make sense to put something like this into iOS because it can't be built on iOS. It doesn't make sense to put it into AOSP.
Earlier you said AOSP had a framework for push notifications, a statement found to be false when checking the links you provided.
Now you say it doesn’t make even sense to put this feature in the platform, confirming that you were lying when you said it already was part of the platform.
AOSP has a framework to support multiple backends. It's called the Service framework. With it, you can build a library to simplify dealing with backends, and I pointed you to one such library.
> Now you say it doesn’t make even sense to put this feature in the platform
Of course it doesn't make sense to build that library into the platform.
> Why are you talking about iOS?
iOS doesn't provide the ability to make this possible, which is probably why you are so confused.
You speculate that Amazon may have an internal framework for this, but so what? Even if your guess was correct, that’s not AOSP, and it’s not open.
Your statement that AOSP ‘already does’ this simply isn’t true.
It seems like you don’t distinguish between things that are possible in principle, and things that are actually true.