What would be wrong with creating a "mega communications App" -- separate from the core operating system that could be turned on or off at will?

Are you willfully this obtuse or just genetically predisposed to obtusity? Again, all this can be turned off! And the point of baking it into the operating system is that it's available everywhere. You can share from any application. If you don't understand that, then you probably shouldn't be writing about this subject.

Not that that wasn't already painfully obvious.

Just because you call an Elephant a Mountain Lion does not mean it can jump smoothly from cliff to cliff.

And just because you string a bunch of words together in English doesn't mean that they're true or make a lick of sense.