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

So did [default exports](https://blog.neufund.org/why-we-have-banned-default-exports-and-you-should-do-the-same-d51fdc2cf2ad) and it's I'm sure it has already cost our industry billions of dollars in refactoring and product complexity. 

1) Specification completes
2) It's implemented
3) It's built into tons of solutions
4) We realize it's a really bad idea
5) We start to refactor all the code that implemented the bad idea
6) We teach people not to do it (Which adds to cost)

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