When should you choose useReducer over useState in React?

Imagine you have a big box of LEGO pieces. If you only have a few pieces to build something simple, you can just pick and place them easily. But if you're building a complex LEGO city with many parts, you might need a plan to keep track of everything. useState is like picking pieces for a simple build, while useReducer is like having a plan for a big LEGO city.