While reading you're more prone to analyze and think about the subject, while videos are sort of mechanized, in which generally people don't pause and reflect on what's being said.
I can totally relate to the meditative calmness you talked about. I'm pretty sure, it contributed to my personality development as well.
I wonder if I'd have been more distracted and restless if I could see everything clearly.
You're a good father and what you wrote I agree, I don't know why some people downvoted you. Mutlitasking kills. What's wrong with a man telling his kids to not do multiple things at once and focus on the more important matters first?
When I learned set theory and relations for the first time, I was in love with the abstractiveness of mathematics. It was so intuitive and I truly felt that I've got the grasp of fundamental principles of maths. The sad thing was, we were introduced to set theory in Grade 11(17 years old), that's too late IMO, it should be taught around Grade 4.