What is the most important operational driver in building a resilient and secure modular network design?

Dependency on hardware or software that is difficult to scale is a design problem to avoid, not an operational driver to pursue when building a resilient network.

Minimizing application downtime is a desirable business outcome that results from resilient design, but it is a consequence rather than the primary operational driver behind the design methodology.

Reducing the frequency of failures requiring human intervention is the primary operational driver because it directly improves resilience, lowers operational expenditure, and removes the latency and risk of human error from recovery processes. Modular design achieves this through redundancy, automated failover, and fault isolation so the network can self-recover without manual involvement.

Increasing time spent developing new features is a product development goal and has no direct relationship to the operational priorities of resilient and secure network infrastructure design.