Because the web was simple and homogenous before this?

I will be fair and the answer is no, but at least for the last 2-3 years we have a little stable environment. If it's ruby app we know it's rail, if it's Python we know it's either Django or Flask (or Pyramid). When we think about client side we think of jQuery and pure Javascript. I know there are coffee script lovers and I admit it's great that people coming up with new tools, but we have too much to digest.

There is a certain degree of peer pressure coming from our co-workers and our webdev community - if you are programming in PHP you are doing it wrong or if you are still doing MVC and not single-page app or node.js you are behind the trend. I have little knowledge about what Dart does but from multiple sources people seem to think Dart is Google's alternative to Javascript, which makes me uncomfortable because I start to feel like I am at the second Web/browser war where large organizations like Google is pushing their own version of "Javascript" (back then we got what? javascript, active script? etc?).

>I will be fair and the answer is no, but at least for the last 2-3 years we have a little stable environment. If it's ruby app we know it's rail, if it's Python we know it's either Django or Flask (or Pyramid). When we think about client side we think of jQuery and pure Javascript.

If you think that, then you're misguided.

Supposedly nothing is stopping angular.dart from working with polymer.dart.