I won't argue that it is a universal truth but it has played out the same for my kids and my friends groups kids.
They treat it like a drug and lose all emotional regulation. I don't believe all screen time is bad, but it is something you have to teach them to regulate and 3 year olds and younger are just bad at regulating emotion in general. Teaching them to do this is just part of parenting. One of the most important things we can teach our kids is that it is okay to be bored. In fact it is great to be bored sometimes.
On the other hand, being a parent is hard and keeping your sanity is important in order to be a good parent. So if it helps you be a better parent all other times, it could be worth it.
The issue is when screens are used to in place of parenting. Parents using it as a way to fuel their own screen addiction.
On the other hand, for me airplanes are a special case and all rules go out the window to help keep the kid calm.
Hard disagree with ‘great to be bored’ - being bored is one of the worst possible feelings, that you’re wasting your time doing nothing when there is almost certainly something you would rather be doing.
As a child I used to hate the feeling of boredom, knowing that I could be doing something I wanted to do. As an adult I am hardly ever bored, and it’s a strict improvement, never have I ever found myself wishing I could just go back to being bored.
Boredom is such a negative emotion that learning to manage it effectively becomes an essential life skill. Learning to set yourself up for success / be prepared required forethought to anticipate the possibility of boredom and come prepared to deal with it. Acting out on boredom is childish, learning to keep yourself occupied so you don’t become bored is mature.