Spoken like someone that needs to put a team together. Sorry but your not the boss of Nightfall's. People can join match making with 0 intention of killing a champion. That's on them, with matchmaking you get what you get. Don't like it put a team together.
Most of the people that you are complaining about are just going for clears, fast clears. Plat means nothing to them.
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Especially since its hero NF