Improvement that now you can add active components when editing the theme, and add active themes when editing components.
When click “add all” only active themes are added. However, the inactive theme can still be added manually (for example if I am preparing a theme before I want to publish it). Also if you click “add all” it will not remove your manual choice. In addition, when all active themes are on the list, then “add all” button disappears.
Demo behaviour is presented in gifs below: