Earlier quoted context omitted.
Another aspect that reinforces your point is that the ATM push (and subsequent downfall) was not just bandwidth-motivated but also motivated by a belief that ATM's QoS guarantees were necessary. But it turned out that software improvements, notably MPLS to handle QoS, were all that was needed.
Nah, it's mostly just buffering :-) Plus the cell phone industry paved the way for VOIP by getting everyone used to really, really crappy voice quality. Generations of Bell Labs and Bellcore engineers would rather have resigned than be subjected to what's considered acceptable voice quality nowadays...
1. it takes considerable work on my part to understand it on a cell phone
2. it's much easier on POTS
3. it's not a problem on VOIP
4. no issues in person
With all the amazing advances in cell phones, the voice quality of cellular is stuck in the 90's.