Why does React focus on pure functions?

Writing pure functions necessitates adherence to specific habits and conventions. However, this opens up remarkable possibilities:

1. Versatile Environments: Components are executable in diverse settings, even on servers! Given their consistency in output for identical inputs, a component seamlessly caters to numerous user requests.

2. Performance Optimization: Opting out of rendering for components with unchanged inputs becomes feasible, enhancing performance. This prudent strategy leverages the safe caching enabled by pure functions.

3. Dynamic Rendering Control: React gains the ability to restart rendering when data alterations occur within the depths of a component tree. The inherent purity facilitates the secure interruption of calculations at any juncture.