Originally Posted by
Wrecktangle
The point I was trying to demonstrate is that there are times/points where wings is up and if you do not pop it on CD you're effectively wasting CoF procs, thus reducing its effectiveness. These points happen commonly in M+ on both affixes (Tyrannical/Fortified). I'm not saying it doesn't have value, I'm just pointing out its flaws in actual practice. Esp if you know you're planning on using Hero/Lust on said boss and you want to make sure you have wings up for it.
For reference my group and I of mere heroic raiders easily completed an old +18 (2 chested, almost 3, missed by less than 2mins), but saw no reason to go any higher. This was pre-Nighthold.