Here is something I don't get in a way. And I know my poor brain is wired differently.

Those who love speed runs, want to get as many RNG rolls in as possible. Ok, so a dungeon with a sped run finished in 10 minutes. Or less, yes I understand that. Normal pulls, 1-2 groups at a time only, the dungeon takes 15-20 minutes. Exactly how does leaving the dungeon, taking a 30 minute hit, re-queuing, going into the BACK of the line, getting another group you have no idea will speed run or not, get you that next RNG roll faster than just sticking with the original dungeon even if it took 20 minutes?