She was so focussed on it and started crying when we hid it after only a very short time. This is not normal a behaviour. This only happens with things that are very addictive (also for example sugar). I do understand that not everybody can do it like that, but if you can create such an environment it's much better for them (in my opinion).

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.

There was a time people used think the same about books.

not that guy, but it would cause our kids to completely emotionally deregulate, and become fixated on the TV for a while.

and most TV is not great for people. there is a reason depression and anxiety correlate with TV time

their vision is still developing and staring at a screen is not good for eye development.

it removes stimulation and interaction with the environment and replaces it with sedentary and no physical interactions.

While the exact reasons are not common knowledge, knowing TV is bad for toddlers is.