I understand it's frustrating but I think the bigger issue is more why are people who have zero knowledge of even the basic mechanics of a fight queueing in DF at all. I don't go into these duties expecting to clear because the NA/EU player base attitude towards hard content is to use DF for learning the content before trying to gather a party and clear in party finder. There's nothing preventing players from watching a video to at least familiarize themselves with basic mechanics of the fight they are trying to clear. This is the attitude that keeps experienced players from queueing at all. It's a waste of my time to teach random people where to drop meteors so we don't wipe or how to pull a golem to the wall if they took aggro on it.

JP use DF to clear content. It's an insult to join in DF and not know the fight. I see the NA/EU attitude of DF=learning starting to shift as people queue for T6-7 wanting to farm and clear for loot then actually kicking people who don't know the fight. It's a slow shift but using df is far more efficient than pf groups so I personally hope this trend continues.