Additionally, our education systems reward repeated success and high marks, not exploration and failure. Thus purely from a stats and analytic perspective, the winning strategy to navigate through such a system is safe specialisation: which again, will trend towards one dimensional students who don't experience or seek out or tolerate failure well. This they stick to what they know, do not push past the limit offered by their graded courses, and tend not to put themselves out there to tackle/expose their weaknesses or areas they view as oblique to their field/strengths.

Show me someone with few failures, and I will show you someone who has never pushed our challenged themselves successfully...