I simply will never understand the obsession with droning, monotonous automated voice-bots repeating the same thing over and over again on a collection of very low power scratchy signals that hardly no one listens to or even knows exists.
I'd abolish the whole network if I could.
Because in an emergency when the power goes out, a simple radio with a battery in it can receive the droning voice.
That's the main reason such things are retained, and they do also go out on modern technology as well.
Having a modular system that the person issuing the warning can do so with a few short steps also allows the warnings to get out quickly.
The day that power outages never happen and infrastructure cannot be damaged is the day that such systems can go away. Technology is great when it works.
Its part of the reason I have a solar/battery powered Ham Radio station. The radios do no good plugged into the wall when the lights are out. Sure, I have a Generator, but its got other loads it needs to handle first, and I can't run a weather net (or hear one) too reliably with a handheld, though I have those too.
A lot of the weather service transmitters, by the way, are in the 50 watt range. Weaker than your local FM radio "blowtorch" but with an outside antenna are easily readable. The mistake a lot of people make with weather alert radios is failing to read the directions regarding proper placement. In the middle of your house they aren't going to work worth squat.