[joewood1972]

JSX has zero community adoption? Or was there a missing comma in there? Of the React code I see, I would estimate that JSX adoption is high 90s.

I've used both Angular, played with Angular 2 and React. Plus many other MVC (and MVVM) libraries. I would say that the state managed React model is far more scalable than the traditional MVC 'observable' model. Sure, you can use immutability in Angular-2, but with React you have an architecture built around simplicity with the need to integrate different artifacts.

JSX helps React to scale because it extends type safety of TS or Flow into the UI DSL. JSX allows the developer to deal with the DOM as an object graph expression, right in the language. From a strongly typed perspective, this works much better than templates or embedding code into HTML.