Did you know not performing as you think another player should in a group

[Destatiredux]

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You are both correct to an extent. Duty Finder is a means to access content for ALL players, not just new people. Likewise, Duty Roulettes were made as a separate function of the Duty Finder to ensure that veterans return to help new or returning players with content new to them while earning rewards. However, this is not the case for the Expert Roulette, which was made less as a function to help players new to that content and more to help veterans grind for tomes and gear. This is why the Expert Roulette only rolls the three most recent endgame dungeons, as most players who have reached level 70 (and who should know their job) have already cleared this content. This distinction is what the OP needs to realize when we say the BLM was not new (arguments of why a level 70 doesn't know his job notwithstanding) and perhaps the OP doesn't know that because he hasn't reached current endgame content to even know what the Expert Roulette is.