If VoIP actually used the capability to deliver higher call quality, that would be one thing. But these services almost universally sound like vocoder compresse

If VoIP actually used the capability to deliver higher call quality, that would be one thing. But these services almost universally sound like vocoder compressed noise in an echo tunnel. They're as bad as cell phones, and have as much latency, which makes conversations very hard. "Could you repeat that" and people talking over each other is much more common now than 20 years ago.