Thanks for this summary S, the "living style guide" mentioned in https://www.mediawiki.org/wiki/UX_standardization will include not only the visual styling of agora controls but best practices for using them. e.g. things like order of buttons (primary CTA rightmost) and what types of buttons should be disabled when invalid input is detected (places where a post would result in an error) as well as when to use different styles of buttons.