Quote Originally Posted by Hierro View Post
Upheaval is good in any situation. Playing optimally means keeping it as close to on cooldown as possible. You want to be a swiss watch when it comes to hitting that button exactly 30 seconds since the previous use. It doesn't matter if your HP is low, it doesn't matter if slashing debuff or storm's eye buff fell-- if that skill is off cooldown, use it ASAP.
Did someone do the numbers on how the ratio of potency:HP scales? I'm not denying you are right that in theory Upheaval needs to be used on cd but with my experiences at least I seem to not really have an option either because I drop combos due to mechanics and/or I'm 2 gcds from a dual FC before a boss jumps. I usually find myself weighing in the fact that I can either use Upheaval or wait 2 gcds for a FC. Upheaval during ToB is for sure mandatory an even more so with IR so that goes without saying. I pug through content and am o10s clear so I don't have the luxury of a static where I can be more consistent and optimal with how I play.