And as I speculated in a previous post (https://www.bungie.net/en/Forum/Post/262411126/0/0), the Lightfall Eoxtic armors have to be unlocked from Lost Sectors, and the "additional path" is awful for farming. And it crashes your game.
Lost Sector farming for exotics needs a massive overhaul.
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I knew they were lying because they said they would look in to the exotic drop rate and see if it needs changing. They wouldn't have bothered looking at the drop rate if they were putting the armor drops elsewhere.
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The only additional source I've seen is the vex event in the incursion zone that has guaranteed an exotic. However, it does not seem to drop ones you have not acquired like lost sectors. Plus, it is random and rare spawn making it entirely inefficient to farm them.