As if ThreeJS is too hard or cumbersome without React.

Or this: https://github.com/FormidableLabs/react-game-kit

Or this: https://www.npmjs.com/package/react-audio (a relatively unknown library, but it's surprising how often projects will import packages like this)

I generally do what I can to avoid software snobbery, but it's examples like those that really cause me to scratch my head and exclaim "Why?"

React makes sense when you actually have a DOM to deal with, but as soon as you start trying to write something that goes beyond that model, well, I really don't get you. ("you" being rhetorical)

Generally, though, I think a lot of junior programmers or those new to React get very enthusiastic about it and try to solve whatever problem they can with a tool that works well for them, and that does speak quite a bit to how good React is. In general, I would avoid using React for things it was not designed for.