I used to fly to and from NZ from Scotland every other year growing up. I never seemed to have a problem flying. The airlines would give me a kids pack with puzzles, colouring in etc and there were always films on the overhead screens.
I’m not talking about anyone’s kids in particular, but perhaps the children generation of today are too used to having readily access to a television/computer screen and find it hard to entertain themselves otherwise.
I would be okay without seat back IFE as long as I had music and a magazine, I think. But definitely wouldn’t prefer it!