Re: [w3c/webcomponents] Support /deep/ in static profile (bugzilla: 28591) (#78)

> Now, since there may be relevant custom elements to update in the shadows of other custom elements (majority case), instead of `document.querySelectorAll(name)` a small utility is used to search across all shadow roots if the browser supports it.

But anyone could add a new instance of a custom element dynamically to any shadow tree so you'd end up continuously monitoring mutations to every shadow tree.  This is **extremely** inefficient.  Just walking the entire composed tree to find all instances of a given custom element alone is too expensive.

If you're concerned about tracking all instances of custom elements, wrapping custom elements' lifecycle callbacks might be a better approach (i.e. track lifecycle callbacks in your framework, and then delegate back to each custom element later).


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