[EugeneOZ]

In my first response to you I underlined I don't mean business logic.

It's the example from "JSX in Depth" (https://facebook.github.io/react/docs/jsx-in-depth.html)

  // Input (JSX):
  var content = <Container>{window.isLoggedIn ? <Nav /> : <Login />}</Container>;
  // Output (JS):
  var content = React.createElement(
    Container,
    null,
    window.isLoggedIn ? React.createElement(Nav) : React.createElement(Login) );

And it illustrates exactly what I'm trying to say: composing page from JS with conditional logic. It's plague, because it will be painful to edit.

[tptacek]

I find it vastly, comically easier to edit React/JSX than templated Angular and Knockout.