The answer
Primitives like Button are highly reusable across the app. Feature components like Feed are reusable within a feature. Page components are usually one-off, since each route is unique to that screen.
When to Build Reusable vs One-Off Components in React
What are the reuse levels in React?
More FAQs in When to Build Reusable vs One-Off Components in React
When the same UI pattern appears in multiple places, like a Button or Card used across pages. Reuse saves repetition and keeps consistency. Extract after you see real repetition, not preemptively.
When a component is used in only one place and has no clear future reuse. Forcing it into a reusable shape adds abstraction without benefit. Leave it as a one-off until real repetition appears.
Being configurable through props. If you cannot configure a component for different uses without copy-pasting it, it is not actually reusable; it is a template. Reusable means configurable.
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