Why do firms tend to cluster into strategic groups?

Your new company must plan for adaptability and alignment both internally and externally due to a crisis and other unexpected events, such as a mortgage crisis, a fire, IT system failure, loss of a major customer, loss of suppliers, union strikes, or terrorist attacks. How do you identify a crisis that Kibbles and Bits may experience, and explain how Kibbles and Bits would adapt and align in this crisis?

why does strategic management matters to a company ?