Buying one capability does not automatically require selling or cancelling another. Britain once operated Ocean beside the Invincible class and kept Albion and Bulwark while adding Bay-class ships, demonstrating that complementary roles can coexist. The Royal Navy improved its position by making strategic and business cases for how proposed equipment fits national policy. The Army had relied for years on the immediate demands of Iraq and Afghanistan, so it entered a later defence review less prepared to explain its needs once those campaigns no longer supplied the argument. Procurement outcomes depend on technical merit and a service's ability to articulate a coherent future mission.
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Building the case for complementary military capabilities
The choice between carriers and LHDs, crewed and uncrewed aircraft, or SSNs and SSKs is often false; services win funding by showing how complementary systems meet a strategic need.