brew outdated will list outdated app/dependencies that need to be updated. If you want to know the app's dependencies, use the info argument. For example brew info ffmpeg will list the information about FFmpeg and list the dependencies that it uses along with status indication if the dependencies is installed or not.

Am I missing something here? I am not sure if it is a UI problem since Homebrew have those functions with a few arguments here and there. Look like you are using a utility that have so much dependencies that it needs or you have habit of using brew upgrade which will prompt to upgrade everything expect pinned apps/dependencies.