You hear it first, well back in D1 when you needed something so powerful like our beloved ghally*. Now a different problem with Guardians being "oh you gotta know what you're doing for this new raid to play with us". How are we suppose to know what to do for the new raid if we don't have the experience to learn with each other! If u have that bad of a problem or time to teach someone play with ur clan not trying to find random and be so rude!
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I mean it‘s „[b]know[/b] what to do“ and in my opinion it‘s okay to ask people to at least watch a guide before joining. In lfg groups people are joining and leaving, what feels like every 15 minutes, so it‘s understandable that lfg groups want people to at least be prepared.