Life Should Be Simple.

So perhaps, just perhaps our experts have been relying on continued exposure to the 'educational factory' to remit these (ADHD ++) symptoms, 'natural remission' so to speak and the 'negative pathways and lifelong trajectories' may just be fear-mongered 'bunkum' ... the sort of stuff that begats an industry. There seems a strong argument here for increasing vocabularies and mathematical skills at an early age though and to fluency, which of course is necessary for functioning well in a system that involves cumulative learning.
In one study, an international team of researchers analyzed measures of social and intellectual development from over 16,000 children and found that disruptive or antisocial behaviors in kindergarten did not correlate with academic results at the end of elementary school.
Kindergartners who interrupted the teacher, defied instructions and even picked fights were performing as well in reading and math as well-behaved children of the same abilities when they both reached fifth grade, the study found.

In the other study, researchers from the National Institute of Mental Health and McGill University, using imaging techniques, found that the brains of children with attention-deficit hyperactivity disorder developed normally but more slowly in some areas than the brains of children without the disorder.

While there was little correlation between behavior problems in kindergarten and later academic success, the researchers did find that scores on math tests at ages 5 or 6 were highly correlated with academic success in fifth grade. Kindergarten reading skills and scores on attention measures — where youngsters with A.D.H.D. falter — also predicted later academic success, but less strongly than math scores did.