The same you could tell with equilibrium. If you use it at high hp there is a chance you will overheal and waste a big part of it.
I found myself using ahrora more than i do equilibrium on war. Its because of its sustained heal, its really hard to waste it and it does contribute to the gnb defenses, and give healer more time to adjust. Its a really good supporting heal as well it does heal a great part of healers hp if needed and i did used it on other many many times including MT.
Aurora > equilibrium > abyssal drain > clemency.
You dont need a burst heal in this game, healers already have it, if you geg hit by tank buster and get 50% hp taken away you dont have to heal immidiately to full...