The original title is "React 19 Features — What Actually Changed and What I Use"

Short summary

React 19 stabilized Actions for form mutations, added useOptimistic for instant UI feedback, and use() to eliminate useEffect boilerplate for promises. Author shares production experience on Indian mobile networks, recommending selective adoption where patterns solve real UX problems and waiting on React Compiler stability. Strategy: adopt changes incrementally instead of wholesale rewrites.

• •useOptimistic enables instant feedback on mutations; useActionState reduces form boilerplate; use() reads promises without useEffect patterns
• •Author prioritizes production readiness: adopts where it solves real problems, waits on compiler and ecosystem typings
• •Incremental adoption over rewrites; selective upgrade path for Next.js 15 projects

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