You should read the article (and avoid being so dismissive). Functionality like Mutation Observers are exactly the kind of abstractions that will make "dynamic

You should read the article (and avoid being so dismissive). Functionality like Mutation Observers are exactly the kind of abstractions that will make "dynamic behavior and services" (as vague as that is) all the easier. Also, maybe you have a weird definition for "widget", but go watch Bret's latest talk. It's all widgets. And it's certainly not dynamic magic; we can build interfaces like that, but more and better tools to make building them easier are a very good thing. I'm personally really excited from what I've seen of Polymer, and even more excited about its mostly decoupled design (and the polyfill-until-standardized approach the GP comment mentions), allowing you to pick and choose what you want to use without committing to some huge (and "opinionated") framework.