@volpeon yup. groups for discoverability, tags for categorization
some shortcomings of groups could be rectified by allowing posts to be in multiple groups (however: this would issues when moderating replies. perhaps preventing groups from moderating replies and letting fedi's high moderator-to-user ratio take care of that would be ideal?), and making "remove from group" "detach" the group from the post without removing it outright so your own followers could still interact with it