I think this is going a bit too far between you two.
Fighting over who is best in raiding and m+ as a healer.
But I just want to remind you (reading this comment of yours)of how old disc priest was required for every raid group for atleast a couple expansions i know of including WoD for example. Your utility was having shields, which is the biggest utility a healer could bring to a progression raid back then. In WoD disc was simply required to progress on Butcher and first boss in brf as an example, but every tier every raid had 1 disc in it back then.
Then we could look at for example mythic KJ where disc again was required for their retarded burst aoe healing. Even though they couldnt heal during intermission, the rest of their healing made up for it tenfold.
Now again we are in BFA, and ppl are progressing on the current hardest content with 3 disc priests each, sometimes 2. Why? Because again, cabal wants you to have those extra absorbs on ppl who are on high stacks and have pretty much no HP.
Back in Uldir they said they wont be good on Vectis, because there is no target to hit in intermission…but they still ended up being super strong for…burst healing important phases.
So i definietly see a pattern of disc having the utility pretty much every expansion i ever heard of.
MoP? I heard disc was a god. I also seen them pushing cms back then.
Vanilla? Only viable healer was priest.
(I started end of MoP and these are all just things I have seen and heard afterwards)
Now disc had a patch, where they were way way ahead of any other healer in raids. They got a nerf.
Healer balance atm is pretty close. Maybe if we ignore glimmerdins anyway.
Druid is simply suited for small group healing more, but a nerf to any of their healing would just break them in raiding, where they are nowhere near OP, rather mediocre.
Dont i agree that priest is harder in dungeons? Yes. They are. Simply less suited for that environment.
But their throughput rocks in raids though.
As for number differences on rio. Well first off i would count disc and holy together and compare that number to the rest of the healers. Since if you play priest, you have the option to switch at any point. Compared to the other specs except druid, the numbers seem to be pretty close.
As for why druid is where it is. Druid just has the strongest tools to heal 5men.
Its not about the utility. Sure it helps. But when healing matters, you take the healer who can pump enough to kill the hard bosses.
Its laughable to think that druid is somehow superior because of curse dispel for example. On the witches you mentioned, that only helps you dispelling yourself(or one target total) when the debuffs go out. In the end its effect is negligible. I dont remember a single instance where a curse dispel would be more beneficial as you said vs disease that it would make druids so amazing to ignore any other healer.
And yeah, on my monk i can just tell my group to ignore the mushrooms in underrot for example and just revival it off the group. Thats also utility right?
Its rather just differences in basic tools that make one better in dungeons. Monks essence font for example weakens a lot and just doesnt have the kind of healing that a dungeon requires. Wild growth on the other hand fits in perfectly. All druid tools fit right in.
Pallies only problem is that they struggle outside cooldowns.
Shamans lack single target healing and their only “tank cooldown” is slt.
As for priest, i agree that they lack defensives vs first 3. And that their st healing is not the best either.
Im not defending blizzard for not being able to balance healers raid vs dungeons because they cant. Even druid vs monk, aoe healing feels a lot cheaper and easier on druid, but they do similar in the raids.
But overall priest has the utility. It just doesnt have the numbers and ofc there is the problem with not having an enemy to target on grievous and bursting weeks.
You have an offensive dispel, fear and aoe knockback. Shields. 30% aoe DR on 3 mins and the strongest tank cooldown(even if its long cooldown) and there is rapture which is spammable shields.
And brings the dps and the stamina buff.
You seem to ignore the utility your class brings saying its not useful at all.
Its not like the utility part is that far apart between them.
Priest was just designed for a bigger group.
Overall i agree some of what you said, and many things the monk you are fighting with said aswell.
You are a bit overreacting considering how strong priest has been in the past, which you seem to just ignore for the sake of making an argument.
Sure they are not the best to do m+ with.
Disc is definietly the most wanted healing spec for high levels of mythic raiding ever since i started playing this game though and holy usually has very strong throughput aswell, though yes, they lack utility vs what a disc can bring and more on one level with druid and monk in that field.
Classes have their ups and downs, but disc definietly seems to be top tier in atleast one area of the game going way way back.
Druid only has dungeons as their big area. Lets ignore pvp exists here for the most part since i dont pvp at all. But i heard discs were invincible some patches ago. Maybe the nerf hit them too hard, thats really not something i want to get into right now.
I think i brought up some examples for you and ofc feel free to bring up reasonable arguments against it.
I did agree with priests lacking defensive and some throughput in 5mens vs raid but its something about class design rather than simply just about numbers.