I know this probably sounds dumb, but since they changed the dungeons and raids to be -10 light, I've been struggling to complete dungeons with my friends. Their loadouts are not the *greatest* since they don't play the game as much as I do, but even I'm having some problems doing a *normal* difficulty dungeon now too. I personally feel a normal difficulty dungeon / raid shouldn't cap you -10 power level.
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This game actively punishes you for not playing with the same tight knit group over and over like streamers, content creators, and the Uber hardcore players do.