The document discusses trends in models of human behavior used in design thinking methods over time. It argues that design thinking methods have evolved in parallel with philosophical assumptions about human rationality, moving from intuitive designer to bounded rationality to reflective practitioner. However, it critiques this view for lacking consideration of opposing perspectives and proposes three reasons why the current reflective practice paradigm may be outdated: 1) the evidence linking models of man to method evolution has flaws, 2) current research suggests humans are more irrational than bounded rationality assumes, and 3) the underlying problem-solution method is falling out of favor despite its reflective aspects. It hypothesizes that understanding the drivers of method evolution could help predict and influence future trends.