All specs face some design issues at the moment I’ll try to share my feedback based on what I’ve seen this season.
Shadow
Stun removal made it way harder to CC to Fear enemy healers. This aspect was a reason why even when it didn’t have the best damage Shadow was always viable. It had reliable way to instant CC enemy healers. Was it op? Not really as it was short Stun into Fear into Silence. Shadow also worked with other casters because it had stun and could lock the target for a short moemnt.
Fix:
Either Shadow needs the stun back or it needs another way to CC enemy healers. My idea is to bring back the glyph from Warlords of Draenor. This glyph was basically causing your Leap of Faith to pull yourself to the ally instead of Griping it to yourself. This way SP playing with meele let’s say Rogue can grip himself and extend the CC go with Fear for example.
Holy Priest
Holy Priest lost a lot of it’s tools that it was famous for. Right now it has a decent throughput but it lacks CDs and damage mitigation. Losing Void Shift hurts a lot. As long as Holy won’t get anything else to compensate it will struggle. Even pushing for Fears right now makes you fall behind without proper tool to recover.
Fix:
You can bring Night Fae covenant spell for Priest that gave some damage reduction and had potential for other uses. Or just think of another CD for Holy. Eventually you can unprunne something but as long as Redeemer + Hymn and Guardian are your only CDs you are cooked.
Disc Oracle
Discipline Priest feels basically unfinished. Oracle is strugling with throughput compared to other healers and has no tools to recover when it falls behind with healing. For example after a CC chain.
Fix:
Unprune one of the cooldowns like Void Shift or Rapture so Priest can recover the situation and heal through it. Right now this is keeping Disc the most back.
Disc Voidweaver
Well… What can I say about this spec. It’s a gimmick at best. It requires playing around it (forget about it in solo brackets). In 2s with Rogue though… It’s not fun to play against it. It’s basically unhealable. Blizzard even nerfed the spec in PvE but kept it’s damage in PvP.
Whenever Voidweaver is good it’s only Voidweaver having fun.
Fix:
Disc Hero talents should be more like distinction between Oracle focused more on barriers and healing with Holy spells while Voidweaver should focus more on shadow spells. Maybe it should have Shadow Mend permanently (with some new apex talents) and be able to heal with 2 magic schools like in Legion but current design is too gimicky and Voidweaver will never be a real choice.