Here's your 0.1%: a card game, https://etg.dek.im before React I was using PIXI.js, over the years it's transitioned from being fully rendered in canvas to not using canvas at all (& now uses webpack, but years ago I had my own bundler mkcjs https://github.com/serprex/mkcjs which was pretty vanilla js, using require let me share code for awhile between server/client until server was rewritten in Rust)

react-motion made animating card transitions very straight forward

During a game you can click on history items to look at previous game states, this is very straight forward with React's model

Sure you could get this all by rolling your own state dom renderer, but that's like saying you can do everything Lisp does in C. Greenspun's tenth rule rephrased as "Any sufficiently complicated JavaScript UI contains an ad hoc, informally-specified, bug-ridden, slow implementation of half of React."