We use React because it is the best framework to work quickly, cleanly and with good results. The composition paradigms of React are far superior to most other frameworks and allow for creating a smart and logical component tree, that is high performant.

Also it can be used to create great UI in combination with ES6, TypeScript, GraphQL and Emotion, if used right. The ecosystem definitely gives solutions to nearly all problems. And I can only recommend using Gatsby, if you need Server-Side-Rendering!