People will always try to hop the meta by crunching optimal numbers, and it's fine to do that if that's the kind of player you want to be. But in truth is has next to no impact on the actual game play execution. It's simply a matter of comfort picks in this case. In no way did the worlds first achive so on the merits of having a 2 monk setup. They did so due to dedication and quick adjustments.

Though it seems the field of those actually competing for 'world firsts' is actually getting quite a bit more narrow. It's beginning to attract the highly-aggressive crowd which is turning a lot of groups off to the idea.