Honestly, my eldest might be one of these (if she weren't home educated).
But she gets relatively little screen time (lots of hours when ill, but that's rare, and usually less than 2 hours a week). She has lots of time outside playing energetically, lots of playdates as well as all the time with siblings, lots of visits to relatives, lots of downtime for free time at home, nearly every meal eaten together as a family around the table, and a mostly home-cooked diet that's full of fruit and veg and goodness and low in UPFs.
And yet she has severe ADHD - probably genetic. Plus a significant speech delay. Her vocabulary is years ahead, but her articulation is terrible so it's hard to understand her. I don't know why - we talk so much together as a family. I really did try with potty training and from an early age - she was 90% trained aged 1, but she was still having accidents aged 5 and isn't night trained.
And the last three weeks she's started having violent tantrums. I'm beside myself with worry. I'm clearly not a great parent, but I'm truly trying so hard. Certainly not lazy or unwilling to discipline or thinking she's someone else's "problem".
Professionals sometimes offer helpful tweaks to our routines/habits/strategies, but nothing major. Every single one has told me what a wonderful mother I am- I know I'm not, but I don't know how to improve things.
Please don't think all the parents of these children with SEN are lazy or too arrogant to listen to advice, or even just working long hours away from their children. I have no idea why my child is one of the "problem" ones, but it's not for lack of effort on my part 😞