Interesting point, John.

We recently redesigned (well nipped and tucked for consistency and more robust display on mobile) the CSS for media buttons and no one could be bothered to even acknowledge the defect (we have code ready to submit with the fixes), let alone accept it.

We'd be delighted to contribute more but it seems to be an insiders' only game.

PS. I'm somewhat concerned about these Shiny Updates as taking more information away from the end user (like error messages) does not seem helpful to me. I could see enabling Shiny Updates by default but allowing developers to turn on more detailed messages. That won't work since WordPress outlawed preferences.