Comment by catlifeonmars

I was going to point out VoLTE as an example of a system which runs over IP but still retains a lot of the concepts from circuit switched days. In theory (if you’re a network operator), you could expose dedicated bearer provisioning with QoS guarantees for applications to build on top of. I guess my point is that you can have tighter QoS control if you can get off the public internet and go through carrier IPX instead.