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

@oleersoy 

> So if we want to have a PE level that we accept that the PreviewTab is not going to load then we should create a test case for this, evaluate to see whether that is actually a satisfying enough customer experience, etc. And doing this across all the browsers is expensive and time consuming.

>  then using that element in full element form only.

Nobody is forcing us to use `is` for a customized built-in, but you have the **option** to do that and leverage PE if you see fit.  Seems to me you are not so much rejecting `is=` but rather PE, even as an optional feature?

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