And yet — I teach 8th grade, and something did shift this year (we're piloting the same age rules my district imported from the Australian playbook). The group chat drama that used to detonate at 11pm and land in my first period... it's quieter. Not gone. Quieter. Even a leaky ban changes the default from "everyone's on it so you must be" to "officially you're not supposed to be." Defaults do work on 13-year-olds.