Great overview @tobiaseigen
@Sara_Noel I agree getting users back to the Category and topics is tough. You can add text in the Group description with a link to Categories associated with Groups.
Another feature request would be to let Categories have a “Private” setting in addition to the current “Restricted/Hidden” so all users could see the Category and description but no topics. The Category description could include a Join link or other text related to joining the required Group and gaining access to the Category.