Enemies all have factions, we know this. But why do we really only care about the Fallen's Factions?
I bet you can't name all the Hive groups, or Vex programmings, or Cabal Legions. But I bet you could name all the Fallen houses. Why? Why are the Fallen so much more interesting?
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Because the fallen houses fight among each other and have significant differences, and story/lore relevance, while the other are pointless