I just can’t see this ever being common. It sounds terrible. Imagine phoning a number, a person answers and you attempt to relay and negotiate a food delivery order through them, in what world is that better than browsing an app? We don’t have to imagine, this is what we used to do. It sucked and almost everyone stopped doing it in favour of browsing an app. It’s just a superior interface for that sort of thing, it’s already as good as it needs to be.
Funny, I much prefer ordering food by phone call than using apps or websites. I find it much quicker and less error prone.
Different use cases, if the apps don't offer what you need because it's uncommon or custom, then the call is superior, apps can't offer every option, so you default back to messaging and a back and forth, at which point you do want realtime communication