@Howtodothiswell
I've read most, but not all, of the thread & I've read your posts.
I think your points about regulation are interesting. I have 3 DC, eldest (DD) doesn't have any interest in gaming - loves her phone, TikTok etc. My 2 DS are utterly screen obsessed, fortunately also play loads of sport so are active. They were continually flouting the pretty generous limits, to the detriment of homework, chores & family life. My youngest (11) has become really aggressive, over-emotional & disregulated. In our case, it was the Xbox not Switch.
I tried very hard to come up with fair limits & not to be too restrictive.
However, last week, he was just impossible. Really badly behaved, jittery like an addict & lying about screen time. I completely removed all screens for a week, TV included. We are half wat through the week & the difference is incredible. He's calm, happy, behaving.
I think the reality is screens are not good for all children, and their ability to handle them will differ by age, personality and anything like ND.
I don't really have any solutions but I don't think you are wrong in the way some posters imply. I think it's a bit tough on DS1 & I do think your instincts to further limit Switch time for now might be correct.
However, perhaps spreading it out more across the week might work, and if you can, playing with him? So he's not waiting desperately all week to get time.
My DNephew is ND & his parents are utterly consistent about Switch limits. There's no extra for Christmas / weekends. It's the same amount of time regardless. They know that if they vary it, it's actually harder for him.
Good luck!