Originally Posted by Palados
The point is that we are interested in how much more healing we can do in a given time frame, not how faster can we cast. As you can see above (and hopefully agree) for DL y% of haste translates in y% more raw hps (y% more spells/healing in a fixed time frame) compared to 0 haste scenario. If you disagree - please say why.
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Definitely not disagreeing with the basic (correct) math. I just want to add...
My opinion: Just like a HoT ticking, healers work within a limited time frame. Like a burst period, a phase between movements, or a whole fight. In a small window it takes a lot of haste to fit additional casts. Over a whole fight a few additional casts are probably not as effective as making your previous casts more effective.
I like mastery because it is an absorb, it is more reliable than crit, and it gives us an effective way to spend itemization points besides haste. I like mastery because every (affected) heal gains additional shielding with every marginal increase in rating. With 4.3 Radiance I gain an extra tick's worth of shielding at ~13.4 mastery or ~940 rating. If I can't reach the ~940 break point then the shielding is only slightly weaker vs losing out on a significant boost if I can't reach the next haste break point.
All of which is secondary to mastery being a great stat for tank healing.