People also don’t seem to understand that just because you’ve hit the gearscore on paper to enter a higher level piece of content doesn’t mean you should. I think that you should not unlock the next tier of dungeon difficulty until you’ve earned the corresponding achievement for the difficulty below. Gotta do the heroics to unlock inferno. Gotta do all the infernos to unlock twilight. Altoholics will grumble at this idea and even I would find myself saying “why did I suggest this” should they do it but it’s the only way to ensure that the player has at least seen and successfully done the encounter on the base difficulty before burdening a group by being both undergeared AND clueless to the fight mechanics.