Randomizing it ruins the point of teamwork. Just because people have mastered your mechanics that you thought were super secret (It's the internet not sure why they're surprised) is not a reason to change it. The change just feels like Bungie is being a petulant child and saying, "NO FAIR IT WAS A SECRET"
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Exactly, just throwing a tantrum because "the most challenging" thing they have ever created was completed within 12hrs of its release and mastered within a week by thousands. Bungie, you got outsmarted because you under estimated gamers and now you are changing the rules.