The problem with playtesting is that it is impossible to predict every last thing any given person may do once a game is out in the wild. It’s an imperfect science where you do the best you can in the moment. I imagine a live service game like Arc Raiders to be extra difficult, given how many playstyles need to be accounted for. And based on a recent interview, it sounds like some of the team at Embark took an approach that involved a randomiser determining their own playstyle from day to day to make sure they weren’t just playing one way.
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