The point is still the same it dose have match making. ToO and nightfall make sense not having MM. Lfg groups have problems beating full premade teams. As for nightfalls all it would take to get sent to orbit is that one guy running ahead in to the darkness zone and getting him self killed. Then you go back to orbit and have to try again with a completely different team.
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It being optional means that it would have no impact on your life at all.
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Right like the optional MM for the weekly.