I maintain POTS because the fcc requires battery backup in case of power outages. One phone in my kitchen, ringer always off. I live in a place where the power goes out when a mouse farts. When hurricane Harvey hit i had phone service over copper when everything else cellular/IP related was out for over a week.

Call me a boomer, but im not getting rid of my POTS service as long as it is copper l. If/when it switches to IP, ill quit paying for it.