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

@oleersoy Speaking of pen vs. pencil, [pencil tips introduces fire hazard, see Apollo 1](https://techcrunch.com/2016/03/17/heres-why-nasa-is-setting-fire-to-a-cargo-ship/)

Keeping, the allegory, making small tip set you ship in fire, making lack of `is` let you loose support for elements with different context, which you cannot rebuild, nor polyfill anyhow, may be pretty expensive.

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