Compared to previous Heavenly Daos, the Fifth Heavenly Dao indeed tends to keep a lower profile.
Her ruler of the Netherworld doesn't hop around everywhere, and it's even unknown whether her ruler of the Netherworld still exists... Her primordial treasure has never appeared, and legends about her are even rarer. Even the few 'primordial weapons' she left in the world were collected and studied by the previous fat ball Will of the Heavens, leaving none behind for humanity.
It is for this reason that Song Shuhang hasn't had the chance to come into contact with her—Song Shuhang's encounters with the traces of previous Heavenly Daos are either through the rulers of the Netherworld or through primordial treasures.
"In the end, you still chose not to fuse all the 'Sixteens' together?" Su Clan's Shield Fairy looked Sixteen up and down and asked, "Why did you ultimately decide to keep the personalities of all the 'Sixteens'?"