I disagree that React is doing anything controversial actually. Angular has logic in it's views, what do you think the handlebars syntax is? The only difference

I disagree that React is doing anything controversial actually. Angular has logic in it's views, what do you think the handlebars syntax is? The only difference is that they added new syntax to JS instead of adding new syntax to HTML. And how much logic you put into a component is up to you. Your components can be almost entirely view logic, with any other data fetching or computation offloaded to other regular js files.