A common frigate hull does not erase geography. Australia focuses on the East Indies, its surrounding oceans, and regional approaches, while Canada must balance Atlantic, Pacific, and Arctic responsibilities. Britain links dispersed overseas territories, their exclusive economic zones, and commitments through NATO, Five Eyes, AUKUS, and the Commonwealth. Those obligations create demands for presence that cannot be met with 1930s-style budgets and much smaller modern fleets. These different commitments explain choices about numbers, air defence, basing, and deployment patterns.
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Geography explains why the three fleets use similar hulls differently
Australian regional distances, Canada's Atlantic-Pacific balance, and Britain's global commitments create different demands for the Type 26 family.