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Umm, have you been to Ulduar yet? There are no 'what if' moments, there are definitely moments where you know you'll have to use a cd to survive an aspect of an encounter. Either you have to use a cd or the boss will need to be taunted to a tank that has a cd available(and/or healers will have to burn their cds). In some case the cds need to be stacked in order to guarantee survival. In order to make yourself more valuable to the raid you should have as many damage reduction cds as possible.
Show me a fight where you NEED to pop a cooldown to survive.
Flame Leviathan: I guess if you're bad and forget to get picked up by a vehicle
Ignis: Not as the add tank, not as the MT. Your healers should not be getting silenced and you should be moving out of the fire.
Razorscale: You need to do tank swaps on this due to the debuff. 20% damage reduction won't help when you have no armor and are taking a bajillion extra fire damage. The loss in threat is going to be too great, due to the phases where the raid brings him down to 50%.
Deconstructor: Unneeded.
Council: This I will give to you. When doing it on hard mode, your tanks must rotate cooldowns to mitigate the
FalconFusion Punch. On normal, as long as he's not in a rune you don't need cooldowns to prevent death.
Kologarn: You don't need this at all. Tank swaps ensure you're never getting too many stacks of the debuff.
Auriaya: Nope, it's nice to run in with cooldowns up in case of unlucky RNG pounces, but you could always sacrifice a Hunter or two.
Mirmon: Nope
Hodir: Possibly.
Thorim: Nope
Freya: Add fight, you don't need cooldowns to survive.
I don't know about General and Yogg.
The point I'm trying to make is this: Like I've said before, it is a SITUATIONAL glyph. It is there for those "Oh ****" moments, where either your healers were sleeping, the boss enrages at 10k health left, you DC and come back standing in a flame patch, etc. Obviously, when doing progression content there's going to be a lot more of these moments, simply because everything's new.
Irregardless, if there's ever a fight where you NEED to pop cooldowns in order to survive (Think Sarth +3, as the Sarth tank) there are a lot of classes better suited to it than a Tankadin. This glyph, while giving us a nice chunk of mitigation, is far to situational (in my opinion, at least) to be of any use as a proper glyph.