There are 0 excuses to not pull at least 2 packs at a time.
The mobs borderline do not deal damage and it only becomes the slightest bit of concerning when its 3-4 packs together, and even then you just rotate through mitigations and they are back up once the boss dies. If people panic over losing 10% of their health maybe they shouldn't tank or make a premade where they are expected to be mentored through the process.