If Ask Ubuntu introduces new tags for different applications in the LibreOffice suite, there will still need to be a libreoffice tag for questions about installing and updating LibreOffice.
Creating new tags for each application in the LibreOffice suite would create six new tags, making a total of seven LibreOffice tags. These seven LibreOffice tags are already used at Superuser Q&A. To me that makes sense because there are different user experiences with each one of the LibreOffice applications. If there were seven LibreOffice tags, there wouldn't be much overlap between the different tags, so searching for questions about using a particular LibreOffice application would be easier. For example, if there is a bug in the Base database application, having a separate tag for LibreOffice
Base would make questions about fixing that bug easier to find.
I don't recommend creating a set of overlapping tags because this will create a source of confusion that will lead to problems reviewing questions about LibreOffice.