Re: [WICG/webcomponents] [open-stylable] Collection of user stories (Issue #1052)

Two non-mutually exclusive use cases concerning styling shadow DOM elements from outside the component that I wish can be supported (but not sure if they can be part of this initiative/proposal):
* As a page author/WC user, I would like to have a way to say, as @chriscoyier [put it](https://frontendmasters.com/blog/a-modest-web-components-styling-proposal-an-i-know-what-im-doing-selector/), "I know what I'm doing" and go wild overwriting anything I want (and not be at the mercy of the WC author).
* As a performance minded web app developer, I would like a way to benefit from the styles encapsulation of the shadow DOM to avoid style recalculation's performance hit as described by @captainbrosset's at [CSS Day 2023](https://www.youtube.com/watch?v=WRiOWJZoKlw) ([slides](https://noti.st/patrickbrosset/NIyBLK/style-recalculation-secrets-they-dont-want-you-to-know#snQR0o4)).

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