PoE 32 and 34, sure. 35 no thanks. Nightfall, positively. Normal raids, its possible a matchmade group would do fine. Hard raids, its increasingly less likely. Trials? Only through a skill based matchmaking system and a system like that can be manipulated. Not to mention it would ruin the concept of ToO. I can see where they are coming from with some of this. I'm honestly surprised nightfall still has no matchmaking though. It's almost always an easily soloable process, but more fun with others undoubtably.
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