Why Speed Pulls?

[Spoekes]

That's actually a pretty big caveat. Unless a fresh 50 tank can no-life his way to a soldierly set in a week, he's guaranteed a month or so of not having any fun at all.

Maybe or not.
Either way he will have this problem with any pull size.
On the topic of pull size, one might argue that smaller pulls favor focus damage, which might not make it easier for the tank than AoE Aggro.