Two is one, One is none, Three is for me.
Absolutely agree.
There is a lot of tech to allow my cell phone to work via WiFi (no local cell service). Starlink bridge, my firewall, my switches, my access points, cabling, power supplies, and on & on. Any failure with one of those could introduce a partial or complete fault that denies me comms.
In a worst case failure of my tech, I can go out to the DEMARC on the side of the house, open the panel, and plug in a proven & working dumb phone to the customer access jack and bypass everything.
Conversely, if there is a grid out failure (think Cascadia full-rip 9.0 for my area), I can power the Starlink via a generator and still have comms (I have a primary & two spare generators + around 200 gallons stored fuel). Even if the on-house Starlink is dead, I can use the Starlink Mini with a 12v battery (yes, that can be finicky, I already have it working reliably). In a TEOTWAWKI situation, there is a really good chance I will have comms.
About the only other alternative is a Ham radio, which comes with a different set of issues. If the antenna went down in an earthquake, then Ham radio may be range limited by handheld transceiver capabilities. I am not saying one or the other is better. Just there is no perfect solution that is a 100% guaranteed. Multiple options using different technologies will quickly get close to the 100% though.
To the original point of this article... POTS service via copper wires exemplifies the KISS principle and should not be hastily discarded when other comms options are limited.