To be fair, having experience in OSes from childhood is certainly a life lesson to the upcoming years within teenhood and adulthood. I'm not undermining this attribute, as within a world of complexity, having any experience already puts you further than most.

I also discovered Linux when I was around 8-9, Ubuntu 10.10 was my first distro (was already 5 years out of date by then but it's all I had), partially daily drove 14.04 2-3 years later, then went full daily some time in 2021. here I am today using a linux phone, all because "hey dad how do I make windows look like Mac"

I was obsessed with computers and machines ever since I discovered them for the first time

Someone who didn't touch a phone until 18 is going to be so susceptible to scams, catfishes, propaganda, digital manipulation, etc, that I definitely think it is a dangerous nuclear option. Controlled, monitored by good parents, layered introduction is definitely better in my opinion.

Actual studies say

The general consensus is the studies say that usage of devices impacts everyone. Let's not cherry pick a particular minority here, just to explain that stripping their already insignificant rights is a good thing. In addition teenagers, which are not children, are dismissed here. According to studies they are more similar to adults in therms of decision making capabilities - dismissing that is ageism.

I think no phones until 18 would be doable

This is essentially the same speak as the laws trying to ban privacy for all. First of all where is the consent? Also, what is the sense of punishing the minority for being who they are, stripping their rights, if the perpetrators are still unharmed? In essence, phone and laptop usage wouldn't be so bad for anyone (not just kids or teenagers), if we focused on the actual problems not turn to discrimination.