I also have a 2 year old son and am very curious about this.
It's tough, because I do know whatever I do won't be ideal, and we won't know till later when we learn more about how our brains work what we really should be doing with regards to screen use by kids.
And, at the same time, things are accelerating fast, so there's a decent chance tech is totally different by the time our children are in high school, or even elementary school.
I think that in an ideal world, we'd all use technology all the time and it'd be a natural extension of ourselves letting us be fuller versions of ourselves and more present with each other. It's a shame we're not in that world yet, and I'm hopeful that as we get richer humanity starts designing tech to be more agency increasing with this target in mind rather than losing agency to shorter term incentives.
With our 2 year old, I think the highest impact thing we do is try to strict about being present with him and not on our phones. I suspect this might be much more important than whatever rules are established for a child's own use of technology.
Reminds me of the pretty compelling poem "Children Learn What They Live": https://www.freepoemsonline.net/poems-htm/children1.htm