Disc is also completely different to most classes. I do remember playing mistweaver and optimizing tft + x2 chi brew burst phases in my 10 man group back in ToT. That's very different but the idea is the same
Anyway... How exactly do you know how mana starved disc priest is compared to other classes, when almost every resto druid parse has access to multiple innervates? How exactly can you prove this in nighthold when ALL top end parses have wisdoms or innervates in them?
I also don't understand this meme about needing innervates to be middle of the pack. My progression helya log had 1 boomkin innervate over a 10 minute boss, and I was 50k ahead of the next person at the time. The next highest disc log was 110k hps behind. 1 innervate is not literally 100k more hps for disc, that's insane. That difference is coming from the very large skillcap difference between me and other disc priests.
Like I said, yea disc needs innervates to achieve insane numbers, but you certainly don't need innervates to do competitive hps in your raid. You just need a working brain for that.
I don't really know what you mean with a. I'm guessing you mean why did disc dps go down compared to your co-dps. The reason is dps have legendaries which increase their dps, and disc does not have access to these (outside of smite belt which is only a viable legendary for 1 boss this tier). A lack of good dps relics and healers not getting gear on prog also influences this. This is something blizzard should look into. The good thing is, if they find disc dps being too lackluster, they can just increase artifactal damage and call it a day.
For your next point, I don't understand how you can seriously make this point. Rofl if you're doing comparable hps to your co-healers as a disc priest, you're pretty much always going to see a progression raid spot. You're doing the same (or more in my case) healing than your co-healers, and doing 180k+ dps. That's extremely valuable, especially in a tier like this, where the enrage timers have been so tight.
I've posted this a lot in the h2p discord, but people get this weird idea that top end players can play every single class in the game. This really isn't the case. The best example I can think of was apku in method. He really could not play mistweaver monk to save his life. The reality is it's much harder to play disc, and it takes more than 1 pull to figure out a boss. Compare that to a resto druid, which is always going to cast rejuv regardless of the scenario. Disc actually needs a few pulls to figure out timings, and then it's fine. This problem normally doesn't bleed over into mythic, as mythic and heroic bosses generally share timers, but if blizzard ever decides to make M Helya again, disc isn't exactly the best choice for WF progression.
The other issue is disc can't play the role of support. The only way of playing disc currently is big dick max hps at all times, and all your healers play around your weaknesses (burst spot healing, sustained tank hps). This is fine, as your burst/sustain hps with access to multiple innervates is extremely high, and you provide the raid the ability to burst heal any threatening burst of damage, on top of free dps. That said, if you aren't in this position, disc is extremely average compared to a druid.
To summarize, I would say the problem in the wf setting is simply not being good enough at disc (or your disc player quits b4 prog) combined with not being in the role where you can showcase the power of this spec. This has nothing at all to do with disc being unviable. This is something blizzard really needs to fix with talents, which is what sigma has hinted at on the forums.
All the evidences shows is average disc priests aren't very good? Hard spec is hard? I mean my hps compared to other classes being fed innervates/wisdoms is either equal or ahead. if your point was about average disc players, idk why you conflated that point with WF progression viability. I can agree the spec needs help for average players, but it's completely fine in the WF race.
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I mean even in heroic modes you can still plan around disc priests, in the same way you plan around tranq. If you play with bad players who waste mana sniping your cds, I don't really know what advice I can give you. Don't play with bad players?
That said, the spec isn't designed around hc mode content. The fact is all healers are naturally a lot worse in 30 man content, as the damage becomes very random and hard to react to efficiently. The issue really is disc priests don't have a raid cd like htt or tranq which scales with the number of players. I don't really know how exactly disc can fix this problem without completely redesigning the raid cds.
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You either need to take the initiative and try to plan cds around yourself and work with your raid, or accept the fact that you'll perform poorly. There's no alternatives here. Yea it's kinda shitty you're forced to play like this, but if you're going to continue playing disc in a heroic raid, this is what needs to be done. That or bite the bullet and play holy.
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This is really the major problem here. Mistweaver in MoP/WoD had this exact problem. The playstyles are so different between 5 man disc and raid disc. This is a really easy fix though. Disc has all the tools ready to be entirely atonement based in 5 mans (legendaries, scaling damage with mobs, good cds, etc). It just needs numbers.
Imagine if shadow covenant was redesigned to a % increase to atonement transfer that scales down with the number of atonements you have active. This would also be a great raid talent for bosses like star augur, as you would have the healing to deal with random damage, and not lose much total hps during your burst healing phases. The only thing you would be giving up is purge the wicked.