Show them what perks work in PVP and what does not. Teach them pairing a hand cannon and auto rifle might not be the best idea. Teach them pairing a pulse and a scout might not be a good idea.
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#destiny2
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Or people can just use whatever they want, and everyone else can quit taking the game so seriously. If you don't like teammates using certain things, then just go make your own team with people using what you want.