Funnily enough, even with such emphasis on children, the problem is touching adults as well. And that's completely ignored. Movies in recent years have changed dramatically in subtle ways to work with impatient audience.
Take a movie like the Godfather, it had a 8.4 seconds average shot length compared to the Departed 3 second average shot length.
I've noticed my parents no longer having the patience for movies with longer average shot length despite having been young during the era when movies were less fast paced.
[1] https://cinemetrics.uchicago.edu/movie/2732f3f8-f0d4-43f7-a0...
[2] https://cinemetrics.uchicago.edu/movie/9d17ce68-0d48-45cc-89...