Many of the cataclysmic leadership failures were failures of rationality. The pendulum of leadership development needs to swing back toward the rational: strategy, creativity, foresight, decision-making, and analytics.
Mindfulness requires being a beginner. Setting absurdly high-standards, and being unwilling to be a novice, are the joint enemies of personal progress and change. Nobody benchpresses 100 kilos the first time they enter a gym.