I have always suspected that a prime goal of Common Core is to separate the elite from everyone else, to hinder kids who can do rote work very well but may not be able to re-invent math in their seventh-grade minds.
The Soviets did that. They channeled kids into various jobs from kindergarten onward.
My experience in the current U.S. as a retired corporate professional who tried a lower-stress job after retirement is that people who excel are subject to discrimination -- regimented employees bully and hate an achiever, and accuse them of snobbery and "not knowing their place." When I would try to introduce any commonsense improvements that actually worked and boosted performance, especially if it made things look better to the regional manager, the knives really came out.