most missions have 2 win objectives, either do X or kill all enemies. But with respawn active in all but one mode (the one with the captain) killing all enemies is practically impossible since it requires coordinated action to kill all enemies with like a 15 second window
with mechwarrior online this is possible since there is no respawn until the next game and its not game breaking since armor was doubled in that game and it requires some time to kill someone
with this game, armor and sheilds need to be doubled if respawn is disabled to avoid bouts lasting only a few minutes