I'm gonna say something unpopular: I don't like to rush.

[RajNish]

It is nothing to do with comfort. The tanks that do single pulls are playing the game very, very badly. You do not want to justify bad play, ever.

No, they are not bad players. These people may have specific reasons for not doing large pulls, as Vahlnir mentioned above. To be honest, I am surprised by your ultimatum position, which runs counter to common sense.

Same could be said however to those who want to go slower, what you have to communicate is how you're going outside the norm either by being blazing fast or being slow as a snail

You want big pulls. Your tank doesn't make big pulls for some reason. Tell them about it instead of pulling as heal or dps. What is the problem?