Regarding the Star Wars canon, we are powerless here - all our strength lies in the game...
There were many secondary quests in the cut content, and there was development of the protagonist's relationships with party members (Atton, Follower for the female protagonist, Visas, Handmaiden for the male protagonist), where they were supposed to actively participate on Malachor, depending on the protagonist's choice... There was a moment where you could choose to kill Visas and join Nihilus to destroy Telos... In general, they cut out a good third of the game...