The Ace of Spades quest was changed because it was getting impossible to kill invaders with Hand Cannons since most invaders would just sit in the back of the map with Sleeper or Queenbreaker. An invader can easily kill you in Hand Cannon distance with them before you can fire off 3 shots.
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The only change it needed was to add getting hand cannon kills while invading. They went overboard because of people crying.