It's worth noting that React has _always_ been something you could add to an application with just one or two script tags, and the docs were recently updated to emphasize that use case: https://reactjs.org/docs/add-react-to-a-website.html
But writing React without JSX is really not that great in my opinion whereas writing Vue without any preprocessor is totally fine. I know there's the option to use a JSX browser compiler but it's not recommended for production.