I read this recently, and my impression was that the key part was having kids plan (absorbing, playful) activity and then do it for a long time rather than switching around, so as to develop concentration/self-control/the prefrontal cortex.

I notice myself skipping around a lot, especially since getting a smartphone, and I've been trying to implement something similar for myself ("I will read this entire article without switching tabs").

Curriculum described at Tools of the Mind