I waited 3 years for colored bar but then its only if compact tabs are enabled. XD
In Safari if there is only the address bar shown without any (other) tabs, colored bar is still shown and not disabled, or if i enable compact tabs in Orion and show the sidebar with vertical tabs, colored bar is still shown.
Why its disabled for other layouts? Its colored bar/theme, not tabs, or e.g. in html meta tag is called "theme-color" not "tabs-color"... to "customize the display of the page or of the surrounding user interface" ;-)
I use vertical tabs (only) and miss the colored bar a lot! Please enable it for all layouts... but please do not color the sidebar. ;-)