It's something of a clearly ridiculous example and I'm sure a lot of people (myself included) would prefer using more modern solutions 99% of the time. However, I suspect that when you tell most people that also means their 911 calls that basically cannot fail by law now also need to work on Discord or whatever they'll at least take a minute to think about the implications.
911 calls are pretty clearly a special case that is obviously worth pointing out if someone is advocating for literally dismantling the entire telephone system without a very good proposal for replacing the 911 system. That would be a much more extreme position than simply disliking routine (especially unsolicited) telephone calls and preferring than most people in society default to another form of communication.
