I have a minor gripe with how the single class end game PvE lockout works when running 3 characters of the same class. It would be much better feeling if you could still earn weapons and (possible) deepsight patterns as well as possible raid exotics while running multiples of the same class. No need for more pinnacle or powerful drops - nor more armor, just the same amount of chances for weapons as folks get while running 3 different classes.
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Bungie intentionally made the changes to remove any advantage there could be by running duplicate classes. So now, while you are welcome do to so, running multiple of a class will not be able to progress any faster than a person who only plays on one character for that class.