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Redundancy is crucial in critical AV systems primarily to ensure continuity and avoid service interruptions. This importance stems from the need for reliability in environments where consistency is key, such as in corporate settings, live events, or emergency response situations. When a system includes redundant components, if one part fails, another can take over without disruption to the service. This capability is vital for maintaining operational efficiency and ensuring that audio-visual presentations, communication, and other critical functions are delivered without a hitch.

In contrast, enhancing sound quality relates more to the design and specifications of audio equipment rather than the reliability of the system as a whole. Similarly, streamlining user interfaces focuses on usability and user experience rather than on the system's ability to function without interruptions. Lastly, reducing equipment size targets physical attributes rather than addressing the resilience and operational continuity of AV setups. Thus, redundancy directly supports the goal of uninterrupted service, making it the most relevant answer in the context of critical AV systems.