Having already got the exotic it’s frustrating trying to farm deepdives as randoms are constantly trying to do this mission rather than the deep dive and then just leaving when you continue the deep dive normally! The two shouldn’t be intrinsically linked in the way they are! Either that or implement bans for players that are leaving consistently on purpose in this situation as it impacts other user’s experiences. Literally every damn game is this way at the moment shouldn’t have to LFG to complete the seasonal activity!
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Given the way this activity was specifically designed to not allow "join in progress" -- they designed it with LFG in mind.