To Tanks Who only pull One Mob at a Time......

[Zhuyan]

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.

[Silverbane]

There are 0 excuses to not pull at least 2 packs at a time.

There doesn't need to be any excuses ...
... unless you can show us where in the TOS it says that tanks have to pull at least two packs at a time?

Actually says that, not any lame "this general statement means this specific thing for no better reason than I want it to" nonsense. Being cautious is not griefing. Hell, going AFK to answer the door or take a poop isn't griefing, it's just part of life when you queue with random strangers.

And as other have stated, if you want to dictate how the tank behaves in a DF party, queue as a tank.