iPhone
The iPhone's durability presents a study in planned obsolescence. The average device lifespan extends to approximately 3-4 years before software updates, battery degradation, or physical damage necessitate replacement. Modern iPhones incorporate Ceramic Shield glass and aerospace-grade aluminium, yet remain vulnerable to the everyday hazards of gravity and moisture.
The device's reliance upon lithium-ion battery technology imposes a fundamental temporal constraint. After approximately 500 charge cycles, battery capacity degrades significantly, rendering the device progressively less useful regardless of its physical condition.
Knife
A well-maintained knife can function effectively for centuries. Archaeological specimens demonstrate functional edge retention after millennia of burial. The knife's durability derives from its elegant simplicity, a wedge of hardened material requires no software updates, battery replacement, or technical support.
Japanese swordsmiths have maintained family traditions of blade-making for over twenty generations, with individual blades passing through countless hands whilst retaining their essential utility. The knife endures because it has no components capable of failure.