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Re:Introducing Shadow DOM API by arota on Monday October 26, 2015 @12:51PM (#10452614)
The last I had read[1], the intention is to deprecate shadow piercing combinators altogether.

[1] - https://www.w3.org/wiki/Webapps/WebComponentsApril2015Meetin...

Re:Introducing Shadow DOM API by Zikes on Monday October 26, 2015 @12:54PM (#10452637)
I guess that would make it discouraged in all cases, then.