I think its disrespectful to pull one pack at a time. Other people's time have value, and trash packs in dungeons are the one of the least fun shit in this game. Since I'd rather chew a cup of glass than spend 20 minutes mindlessly spamming my aoe rotation, I just quit whenever I get tanks that do this.
Also if you want to "enjoy the beauty of the dungeons" as some people said, do it in explorer mode alone or with others that consent on losing their time, thank you.