The reason this topic isn't in a Destiny forum is because I don't have Destiny so I can't post this there.
One of the main reasons I was disappointed with Destiny is that there's limited exploration.
Several friends of mine still play Destiny and whenever I see them play it they're on the same maps.
Imagine if the entire Halo 3 campaign was only on Sandtrap, Standoff and The Pit.
That's what Destiny seems like to me right now.
I'm a big fan of exploration, so doing the same quests repeatedly in the same areas would get boring very quickly for me.
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I don't know if it's ever being added back for dlc, but I do know Saturn was cut. They showed gameplay of it and referenced it in the old Destiny ViDocs.