The XDG standard covers most of these as well. Cached data that is safe to delete? There is a directory for that. Runtime data that needs to live as long as the

The XDG standard covers most of these as well. Cached data that is safe to delete? There is a directory for that. Runtime data that needs to live as long as the instance of the app? Directory for that. External data your app might rely on but contains no user data? Directory for that. It's very flexible and widely accepted. It's just not accepted _enough_ to be annoying.