Why Move from Vanilla JavaScript to React

Q: Convince me to move from Vanilla JavaScript to a React architecture. A: Key arguments: React's component model encourages reusable, composable UI pieces instead of ad-hoc DOM manipulation scattered across scripts; its declarative rendering (UI as a function of state) eliminates whole classes of bugs from manually keeping the DOM in sync with data, which Vanilla JS requires you to hand-manage; the virtual DOM diffing (or, in newer React, the fiber reconciler) batches and minimizes actual DOM writes for better performance at scale; a mature ecosystem (routing, state management, testing tools) accelerates development; and unidirectional data flow plus hooks make state changes easier to reason about and debug than tracking mutations across many DOM event handlers. Be ready to also acknowledge trade-offs honestly (added bundle size, build tooling complexity, learning curve) since interviewers value balanced reasoning over one-sided advocacy.