“Technology” is a very broad term. A kid could be on social media, passively consuming media or on Khan Academy learning mathematics, actively engaging with the content. So it doesn’t make sense to have a blanket ban on all technology, because frankly you’re depriving the kid of a whole range of other experiences, many of which will be beneficial.
The last time this came up on Hacker News, there was a very insightful comment that basically said that isolating children from technology will isolate them from their peers, thus causing the same problems that the ban was supposed to prevent.
It does seem intuitive to discriminate among the technology but I think there is an insiduousness in assuming some activity to be perfectly benign or healthy.
The problem is that it all tends to blend together to add up to a lot of device time such that even "healthy" tech activities become part of the overall addiction. And, the total time spent on-device comes at the expense of other forms of entertainment/activity, social interaction, and learning which might make for a healthier balance.
So, no matter the content, it's probanly still an issue of degree and overall balance.
The last time this came up on Hacker News, there was a very insightful comment that basically said that isolating children from technology will isolate them from their peers, thus causing the same problems that the ban was supposed to prevent.
Edit: more commentary