[Vinnl]

Well... Despite Polymer's repeating of "use the platform", I always felt React used the platform far more than Polymer. In the end, React is just a way to structure an application that generates and manipulates regular HTML. In other words, you can use shadow DOM and custom tags just fine. If the browser supports it, that is - and if you've used Polymer since before Web Components were standardised (HTML Imports still aren't and will never be), that was a major downside, and the opposite of light-weight.