I think that the mentality come in
I don't do big pull till I am sure my heal and DPS can handle it, I dont so stance dance until I know my tank isn't squishy and my DPS know to dodge AOE
However, it take time to observe the party ability.
I would rather my party play safe than risking of getting wipe because it will get longer
That's the issue of DF, unless you queue with a friend, you never know the players you get in queue and it would take time to observe
I would told the tank I can handle the dmg and do bigger pull if I know I am comfortable or I would ask the heal if he/she feel comfortable for me doing bigger pull.
At the end it is the communication that make the different. Shouting or insulting won't help, but there are just always someone incapable of normal communication and start with a insult or shouting at other