Comment by rspoerri
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).
My three year old would do the same thing if he was playing in his sandbox and I abruptly picked him up and carried him away from what he was doing though. In my experience managing transitions between activities is one of the most important things. If I let my him watch a video and I tell him "I'm going to turn off the TV when it ends", he just goes back to playing with his toys when it goes off.
Don't get me wrong, I think screen time can definitely be a problem. I just think it mostly comes down to whether or not the screen time is at the expense of something else more constructive.