We are at the point where the incremental gains in voice-call quality we're seeing with each new cycle are not even mentioned.
It's frankly surprising that people make regular calls anymore because of the inter-network lack of HD voice; you'd think everybody would make hangouts or FaceTime calls.
Of course, the other likelihood from ignorance is that few people have good hearing.
But, my best example is for doing interview phone screens. (where two people are at fixed positions with high speed networks)
Casting wide aspersions, I feel like it's because you can't get likes/upvotes for phone calls. But, Snapchat shows that ephemeralness is valued, so maybe it's something else behind the war on direct personal real communication.