This is more than just a fine review. @joeljmiller adds good illustrations not in my MAINTENANCE book, and he derives some Principles of Maintenance that I haven't attempted, to wit: "Entropy as baseline. The maintenance mind treats breakdown as normal, sees things as they actually behave over time, and plans for wear, aging, and decay, whereas the neglect mind indulges irrational optimism and acts surprised when things start breaking. "Stewardship as obligation. The maintenance mind owns long-term outcomes as a moral responsibility, whereas the neglect mind treats failure as aberration, defers consequences, and pushes responsibility onto others. "Craft over contempt. The maintenance mind understands upkeep as skilled work that confers competence, pride, and self-respect, whereas the neglect mind dismisses it as menial—beneath the attention of serious people. "Design for the long haul. The maintenance mind integrates design and upkeep—favoring simplicity, modularity, and interchangeable parts—whereas the neglect mind insulates creators from consequences and mistakes complexity for progress. "Learning through feedback. The maintenance mind adjusts through continuous information from problems as they manifest, whereas the neglect mind ignores signals that disrupt its plans or complicate its assumptions. "Authority at the point of failure. The maintenance mind confers agency on those closest to problems and trusts judgment formed through experience, whereas the neglect mind hoards permission at the top and prefers bureaucratic procedures that distance decision-makers from reality."