As a non-native English speaker, calling places is absolutely soul crushing. People cannot understand my name, cannot understand me spelling it, and half of the time I cannot understand them back. Why have me call and tell you my name for you to be typing it when I could enter it in the computer myself?
I've also lived in countries where I'm not a native speaker, so I know how hard it is calling (much more so than speaking in person). But honestly this is a little irrelevant. The split between those who are fine calling and those who really want an app has basically nothing to do with language. Young people in the US often hate the idea of calling even if they are native speakers. That is what I don't understand. As a native speaker of English, calling places is just so easy. I don’t understand the need to replace it with some new process.
So yeah while I understand your issues, they simply don't explain this phenomenon when it comes to native speakers of English in the US.