That would ruin the fun.... I know it's your opinion but you shouldn't get locked out after flawless.
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You've no reason to play it after you have your loot. Do you do the nightfall 9 times on one character also? fair play to all the guys who are pvp beasts, I will be happy with 6 wins.
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You can still get the end rewards from matches like shaders and class items. Plus its fun and not any different than playing normal crucible except more likely to get better rewards
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The reason I keep playing is to keep scrubs out from getting the lighthouse