Repetitive and predictable tasks provide cognitive rhythm, allowing the brain to conserve effort and recover between moments of difficulty. But as automation and AI increasingly take over routine work, humans are left with a different role: handling edge cases, ambiguity, and complex exceptions. In this environment, the brain may face sustained high cognitive load without the natural respite provided by ordinary tasks. Designing effective human–AI collaboration therefore requires supporting perseverance under constant complexity—through better interfaces, decision scaffolding, and cognitive pacing.