Vantage Grid adds redundant backup generators to a substatio…

Vаntаge Grid аdds redundant backup generatоrs tо a substatiоn specifically to satisfy a resilience requirement about surviving a power-source failure. During a later review, an engineer notices the redundancy has also improved the substation's overall availability and reliability numbers, well beyond what the resilience requirement alone called for. Larkspur Health's engineers separately observed something similar: breaking a monolithic patient-portal module into smaller, independent modules — done to make future changes easier to verify in isolation — also happened to make the system easier to adapt to a new computing platform later. What single idea explains both observations?