Re: [w3c/webcomponents] The is="" attribute is confusing? Maybe we should encourage only ES6 class-based extension. (#509)

So I'm trying to make my question really simple because I'd like a straightforward answer.  If this cannot be answered in terms of yes or no please let me know why.  

Again I'm asking whether the minute I add the Polymer `<app-drawer opened></app-drawer>` to my app, it effectively obsoletes previous work done to make a progressively enhanced app?

BTW - I'm saying Polymer specifically because I prefer not get into "Well if it was implemented this way theory".  If we expend enough effort we can do anything.  Just ask the Microsoft team that tried to integrate the browser into the desktop.

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