Except that Vue doesn't ship with all the Polyfill baggage that Polymer does. Polymer has came a long way, but it still feels slow on anything but Chrome.

Once the Web Component spec is finalized, and built into browsers, I think Polymer will be a great choice. Today though, I gotta give the nod to Vue.

Early explosive growth means that the technology is hype-driven; adopters haven't given themselves the time to critically and objectively evaluate the solution - It's not so different from economic bubbles. People get excited and buy into it without thinking and then at some point in the future when they realise that it won't live up to their expectations they all start selling at the same time.

My biggest hangup with trying new platforms is finding a good UI framework to go with it, I like handing off styling to people who know what their doing.

This react below is not JavaScript... it's a reverse template language with a mix of not-quite-html and not-quite-JavaScript. jQuery style code is nicer than that! I hate the enterprise boilerplate in react projects. No wonder they're all failing!

  class Square extends React.Component {
    constructor() {
      super();
      this.state = {
        value: null,
      };
    }
    render() {
      return (
        <button className="square" onClick={() => this.setState({value: 'X'})}>
          {this.state.value}
        </button>
      );
    }
  }

Or could you not hear me over the sound of that axe you're grinding? :)

Wrong. It's a template language, even if Facebook tells you otherwise.

  return React.createElement(
    button,
    { className: "square", onClick: () => this.setState({value: 'X'}) },
    this.state.value
  );

I want to write this, and have it actually be HTML:

    <div>
        <div>
        </div>
    <div>

[1]: http://sgmljs.net/docs/templating.html

Disclaimer: my project, and SGML is most certainly not a "lightweight template engine" by any measure

Most use the html+javascript language which is compiled and then spits out JavaScript and html. This is pretty much identical to PHP - which is a preprocessor template language.

Anyway, facebook says it reminds me of a template language, so I'll believe them.

No, it spits out javascript (the exact same javascript that I wrote), which returns shadow DOM trees (which are javascript objects), which the renderer looks at to modify the actual DOM.

Also not sure what you mean by "looks like" javascript. It's clearly javascript - just a function call with 4 arguments.

JSX by its nature statically checks for tag balance, etc. The non-JavaScript part of its syntax has actual semantics. In a template language the non-Turing-complete part of the syntax is just strings.

JSX is a perfectly good notation for describing how data maps to its presentation in a DOM tree.