The quality of your landline coive service is also dependent upon the quality of the copper line service.
My point wasn't about outside plant, specifically, but about quality of ISP service (which OSP a part of).
But, now if my ISP (vz.net) drops a packet or two, I'm none-the-wiser except for maybe an ever-so-slightly slower web page download. And my voice line is not impacted, that's still rock-solid.