I don't think you understand. Would it be nice if society was less dependant on phones for everything social? Sure. It is your kid's responsibility to evangelize to their peers that they have to? Absolutely not.

This isn't a societal question. This is about affording a kid a social life at all. If a kid doesn't have a phone when all their peers have one, there's no "oh well simply only go to events that are shared on something else than phones", because there are no such events. There's no "oh well only socialize with people who will make the effort to only have conversations in person", because there will be at best one kid in the entire school that also doesn't have a phone (hint: they'll be the "weird" kid).

This is equivalent to your parents saying "you may only talk to people at school, you aren't allowed to talk to anyone once you leave school." Surely you understand that this is a surefire way to completely ostracize and socially stunt your kid, and for what benefit? The only thing you gain is that you get to not parent your kid about safe internet use, a thing you really should be doing anyway because they're going to get internet access at some point.