Once you have a working strategy that you know will give you a kill at that level it's much easier. SLG if you get into third phase clean is super killable whereas something like sludge you have be going 100% the entire time and really can't lose anyone.
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Literally not the same thing no matter how much you try to make it. Killing an undertuned boss while fishing for timers right before bed is not the same thing as flat out not streaming prog of the last boss.