Martin Geddes and Dan York, for example, disagree about the ultimate suitability of IP-based networks for real time services, for reasons related to the very protocols themselves. York, for example, thinks newer protocols such as WebRTC will work just fine. Geddes disagrees.
The disagreement boils down to a fundamental difference of opinion on how well IP-based networks can be made to work. In a sense, it is a philosophical debate (with real world protocol implications) over how well real-time services can be made to work over networks that simply never were architected with “real time” services in mind.
Those of you with an engineering bent will understand this as a “class of service” issue, but also fundamentally a protocol and architecture issue as well. Those of you with some memories of past debates will recognize that the “connectionless” and “connection-oriented” approach to networking is a subject that has not fully gone away.