The Interface Illusion: Why AI Tools Feel Better but Perform Worse

AI interfaces optimized for simplicity often perform worse while feeling better—Walmart's ChatGPT checkout converted at one-third the rate of its website, yet users felt satisfied, while studies show developers working with AI felt 20% faster despite being 19% slower. This pattern persists because the smooth interface is the mechanism of harm: 80% of users blindly accept wrong AI suggestions, and confidence rises even as accuracy falls. The insight matters for any AI deployment: effective interfaces need "cognitive scaffolding" (visual comparisons, decision spaces, trust signals), not just friction removal.