Why is wrapping everything in useMemo and useCallback a mistake?
Because memoization is not free. Each adds overhead and complexity. Measure with the Profiler first, then use the right hook only at the measured bottleneck, not preemptively across the whole codebase.
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More FAQs in useMemo vs useCallback: What's the Real Difference?
useMemo memoizes a value by running a function and caching the result. useCallback memoizes a function reference without running it. Use useMemo for expensive computations and useCallback for stable function references passed to memoized children.
No, though they are related. useCallback is essentially useMemo for a function reference. Use useCallback when you need a stable function, and useMemo when you need to cache a computed value. They have distinct purposes.
When you have an expensive computation, like sorting a list or deriving a value, that would otherwise run on every render. Also when you want to keep an object or array reference stable for memoized children.
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