Earlier quoted context omitted.
> Also FaceTime for calling distant relatives. Are your relatives unable to install Signal or WhatsApp? Yes is a possible answer here, but installing a messaging/video-call app seems pretty low effort. I've had several elderly relatives do it and none required hand-holding, just the name of the app.
Even starting a FaceTime call is a struggle for lots of people. Installing an setting up Signal or WhatsApp is out of the question for a huge portion of the population.
Yes, 90% of global smartphone users can't do it at all :P