Here's the thing: Someone as of day 2 set out to make a guide as far as how to play MCH. Please note I'm not bashing it at all, and I respect his efforts to do so early on, but when I read the rotation and saw Blank in it, I stopped there.

Blank is an extremely situational skill that's really only good for soloing or perhaps interrupting an enemy attack (a la T9 Green/Red golems). Hasn't been on my hotbar since lv 31, and it's likely never coming back. Sure it's an oGCD and against something you can't knock back anyways, it's extra damage, but that doesn't warrant using it at every opportunity. Did the mob get away from the tank? Sure, send it back. Did your DPS buddy zone out and is about to eat otherwise-avoidable damage? Go for it. But in an otherwise standard battle setting where things are under control? Don't be that guy. . .