Originally Posted by
Adaren
Well the theoretical motivation behind our Mastery is that it further polarizes Soothing Mist v. non-Soothing Mist healing styles. If damage is low and you're spending a lot of time channeling Soothing Mist, then you'll be getting less Mastery procs. Conversely, burning mana on spamming active heals (like Vivify) generates a ton of Mastery procs. If damage intake is low and constant, you might be able to get away with a lot of Soothing Mist spam (low Mastery value). If damage intake is spiky, you'll have to go through critical periods where you'll be spamming a lot of heals (high Mastery value).
Of course, if Essence Font, Revival, Celestial Breath, and Renewing Mist turn out to be our go-to spells for critical, high-damage moments, then this theory of Mastery doesn't apply. Hopefully the devs realize that.
It'll be interesting having a Mastery that only benefits half our healing sources. Even current Disc mastery also boosts their non-absorb spells a bit. And unlike Disc Mastery, it's not clear whether the spells our Mastery is boosting have some significant advantage over those that our Mastery isn't boosting. It's all a matter of tuning, but the current design definitely has the possibility of making Mastery a terrible stat if we're mostly doing Essence Font / Renewing Mist / Revival / smart heals.