Reminder that war is still good.

[BarretOblivion]

Not in a raid setting, more mitigation>than some small heal you get from your OT. More mitigation means you don't have to use as many cooldowns. 20k hp is the value of a what is basically 1-2 basic attacks from a boss and that is iff you set up for a "big heal" with inner chaos and a upheavel to weave so you hit enough to heal that much. Most of the time you aren't going to be setting up deliberately for a heal and it falls to about a 12k heal which is maybe 1 basic attack from a raid boss a 1/10th of your hp. Equilibrium is an OGCD that is an instant heal that can crit up to a 40k heal. Nascent flash ignores crit/direct hits and is a flat heal amount.
There is a difference between maybe a 1/6th (or 10/th) of your hp and 1/3rd.
Its not something you care about or think about because its not enough to consider. More mitigation for OT is what most people will consider to save cooldowns.

[Argyle_Darkheart]

More mitigation for OT is what most people will consider to save cooldowns.

No, not necessarily. Mitigation is only strictly preferable over healing if it's necessary in order to survive comfortably. Otherwise, the superior option is whatever most reduces healing requirements, and Nascent Flash can and will often outperform the other OT support skills in this fashion. Now, whether the healers you're playing with can or will adequately take advantage of this is another matter.