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We demonstrate that although diverse IT portfolios (e.g., cloud systems, data analytics tools) can enhance resilience by enabling adaptability, balance is key: moderate IT diversity strengthens resilience, but excessive diversity creates coordination complexities that erode it. Crucially, empowering IT leaders with formal decision-making authority helps firms maximize IT flexibility, shifting this tipping point to harness greater IT diversity without compromising coordination. Our analysis of firms during the pandemic reveals that crisis-induced industry turbulence further shapes these dynamics. Adverse turbulence intensifies the risks of overdiversification, requiring tighter alignment between IT strategies and leadership oversight. Conversely, beneficial turbulence allows firms to experiment with IT resources more freely. Policymakers can support businesses by fostering digital infrastructure, incentivizing IT leadership training, and creating frameworks for public-private data sharing during emergencies. By aligning IT flexibility with coordinated execution, firms can turn crises into opportunities for sustained success. 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