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I really enjoyed watching that stream, seeing the pace of game play. So many MMO today the dungeon content just seems to be about smashing through it as fast as possible, just so you can do it over again or find another dungeon to break the speed limit in. Because of this, no cc is required really, just a tank, healer and maximum dps.
I hope that the ability to switch off xp is in game. I have seen this in one other game and really appreciated it. It was something that I would have liked in Vanguard. There were so many good dungeons that I could not do them all on one toon( not really an issue, but not into alt itis either ).
I do remember one quest series though in some elven town for around late 30 to early 40 level I think, this was for a set of armour which took me several weeks to obtain, by the time I was done I was over level a bit for the gear. It would have been nice to turn off xp, I was more into the experience of the quest series and the grouping with a good reward at the end than going up in level.