"ordering food is usually the simplest of all phone interactions"

It's reaaaaallllyyyy not though... Or at least not for everybody :-)

Never mind the jargon of main order you prepped for, I still freeze when I encounter dozen unexpected follow up questions on sizes sauces cooking cutlery garnishments combos packages savings whatnot. :O

I am with you on morality and approach and downsides of these apps, and how sustainable or fait the model is. But that's an entirely separate chain of reasoning from whether phone or app ordering is preferred :-/