Arcane is one of the best dampeners in the game when being played by a good arcane player.
If you are fighting any melee/ranged or double melee on arcane you can just run circles around the map with ur healer and be untouchable and then they are forced to go on your teammate while you spam unhealable damage
Disc is objectively the worst healing spec this patch. It’s not a bad spec it’s just everything else is better.
Fire isn’t as good and consistent as arcane in terms of damage especially outside of combust, it feels like it does nothing also arcane is way more durable. I wouldn’t argue healers against it though, I placed healers based on where I placed the other healers.