Re: [w3c/webcomponents] Generic programs can't reliably use/manipulate documents via the DOM (#640)

I'd note that we didn't spend a week or two thinking about these problems and come to the conclusion that the closed shadow tree is the way to go. We spent 2+ years continuously discussing amongst experienced software engineers who had been working on the Web technology over decades to reach our consensus. And this is precisely why we reached the consensus to keep `mode` as the mandatory option during W3C F2F meeting. Because this topic is extremely contentious and either party arguing for open or closed shadow tree couldn't convince the other party.

It would take some serious thinking and groundbreaking argument or discovery on your part to convince us otherwise.

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