Comment by kylecazar
Fwiw, I don't have kids but my two nephews went to a Waldorf school K-12 (graduating this year).
They are by far the most well-adjusted young men I'm around. Excelling academically, sports, volunteering, lots of interest in the outdoors, part-time jobs, all of their own volition. Barely ever catch them on a cell phone, despite having their own with unrestricted access for a while now at this point. It might be worth looking into some of that school's principles around gradual introduction of technology specifically (I know there is some other controversial stuff you can ignore).
Although... I do think the benefit in their case is in part due to everyone in their grade having had the same rules in years prior. So, it may be difficult to replicate in an environment where phones are ubiquitous by middle school.