Why must each diver dive with their own computer?

Diving with a personal computer is essential because every diver's profile is different. Individual variations in physical condition, dive experience, and personal physiology necessitate tailored dive profiles and calculations. Each diver may have different limits regarding air consumption, buoyancy control, and tolerance to nitrogen absorption during ascent and descent. A dive computer takes into account these personal factors, providing real-time data and monitoring to help ensure safety throughout the dive. It adjusts for changes in depth and time, allowing divers to receive accurate information relevant to their unique diving scenarios, thus reducing the risk of decompression sickness and other dive-related hazards.

Other factors, like uniformity in dive plans, equipment failures, or team dynamics, while important, do not directly address the necessity of individual monitoring and personalized dive execution that personal dive computers provide.