I have a home in a rural area of upstate NY. When I first built there, cell service was inconsistent. We had Verizon install a POTS line for emergency and home monitoring (I installed sensors that would use the phone to call me if certain conditions were met).Being in a rural area we have both wireless handsets with a base station and one old telephone directly connected to the wired telephone service. The old telephone, powered by the telephone company, works when the power goes out.
That's when I learned just how bad this "rural" phone service was. Service would fail every month. Sometimes it was out for weeks at a time until I learned about it. I would usually find out when I arrived there and had to call Verizon for service. They never ended up coming to the house - the problem was always at some location in town.
All the while, the cell towers were upgraded and now provide a reliable signal. (The local telephone company/cable provider also ran fiber option broadband using some grant money.) Cell phones even work during the occasional local power outage.
WIth a basically 100% uptime for cell phones vs a <1% uptime for landline, I had to concede that the landline served no useful purpose for my situation.