Siri....
"... please explain voice connected thin client networking to me".
Having a central mainframe and a termina^W voice connection to it is all well and good until you don't have a connection, bandwidth or contention becomes a problem.
I expect, just as we are about to burn our apps and rely entirely on Siri, someone will remind us of the advantages of running local apps on our own devices and we can run round the circle again.
If only using Siri for voice activation and controlling local apps, that's an argument for putting Siri on the phone. And that adds another app :-)