I'm a bit afraid of a purely damage route, simply because mirror has to rival 6 second stagger and to a much lesser degree winds of insanity.
With a change like that there is a possibility that witchcraft tree becomes specifically a ST DPS zealot tree, which regardless of how overtuned you make it within reality it will always be a virtually unplayed spec. Bomb Z which is currently somewhat viable cannot afford to touch middle tree under any circumstances because of the importance of heal debuff and CA (zealot in general going DPS is severely starving for mastery points, playing around with builds in online builder is an exercise in frustration).
Maybe I am wrong, and heal zealots might spec for it to pop in harbringer cast it and pop out quickly for a nice set of damage (unless turning off harbringer reduces the already casted ability). And in a way you trade a bit of healing power via scaling and 6 sec stagger for some more group damage. But I really think some kind of utility has to be tacked onto it for heal zealots to consider giving up 6 sec stagger.
Going back to ST DPS zealot, which in reality like "DPS" DoK or AM is hybrid build. What makes DoK and AM (peak buff) good is they do almost as much damage as a pure DPS class but bring buffs, utility, and off healing. And if anyone was wondering why DPS Sham isn't as good as DPS AM it's really just because SM stacking spirit debuff making DPS AM arguably harder than SW and probably 80% of what BW does in sustained damage.
Zealot isn't dealing anywhere near as much damage as even SH, their healing in DPS spec is horrendous unless you drop divine fury then they do less damage than most tanks. The utility is there, with rituals, wounds buff, bubble, cleanse etc... but some of the strongest utility on Z is mostly tied to tactics some of which require healing which obviously poses a huge problem.
But again, even if you somehow managed to capture what peak DPS AM had you won't find but a few groups running it. And that's really why I think witchcraft should cater to both playstyles, healers need a reason to spec into it. And maybe like suggested before a ritual overhaul would help because you can't run the current meta spec on Z and grab withcraft's ritual.
This might also just be me assuming because mirror is changed, it won't receive any love thereafter. And I'd rather wait for the proper time to address it if it's not feasible atm.
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