Originally Posted by
Wrathblood
Except that its not. At present, all that Haste will increase both your generation of GC procs *as well as* your usage capacity by some amount (lets say 4%). In ~2 weeks, that Haste will only increase your capacity. Remember, our ability to use a GC proc is only going to be increasing by a tiny amount at that point (perhaps 0.05 seconds per GCD). Given 30% avoidance and tanking two targets with 1.5s swing timers, we're only going to be averaging a GC proc every ~9 seconds. The odds of us getting 2 procs within the same GCD isn't really that low, it'll probably happen almost once/minute.
The problem is that shrinking the length of GCDs by such a small amount doesn't really help very much. Cutting the chance of getting procs during the GCD by 4% means you're going to be able to take advantage of 2 very closely spaced procs, roughly once every half-hour during which you're tanking 2 mobs, during which time you'll get ~190 GC procs. So, as it stands now, tanking 2 mobs, increasing your Haste by 4% will increase your number of GCD procs by ~2%, and will increase the number of GC procs you can take advantage of by 0.6%. And I agree that it would get more valuable as you're tanking mobs the math for which gets complicated rather quickly.
So, yes, Haste still increases your ability to take advantage of GC procs, and I'll admit by more than I expected. However, you're still significantly overstating the value of this (except, I'd agree, in really extreme cases. If you're literally tanking 10+ mobs for an extended period of time, this could be a thing), and worse you're playing fast and loose with terminology in a way that could be confusing for someone who didn't know the mechanics.