To be fair, Affliction warlocks had numerous “cheesy” things that could be done to significantly make the fight more manageable.
The corruption slow was a big one, but not everyone had that ring. So you could also time Mortal Coil to hit right as Karem phased which would stop his heal and make him resume chasing you, effectively allowing you to nuke Karem in one go and then just deal with Raest while whittling down the adds and soaking the occasional rune.
If you positioned your pet properly, you could also get Karem to aggro to the pet instead of you, of which since Karems attack is classified as AoE, the pets took basically zero damage. (Though this was hard to pull off as the fight started and was next to impossible to get in subsequent phases.)
Everyone I know that did the Affliction challenge did it via one of those three methods. While arguably the Mortal Coil and pet tanking cheese wasn’t intended, Blizzard left it alone and those were quite hard to pull off. But the challenge was absolutely tuned around Affliction having that constant 60% slow on everything.
That being said. This iteration of the Mage Tower would still be challenging and very hard for a lot of people if they were left at the PTR tuning. Massively inflating the health pool of Agatha, Raest, the NPC’s for God Queen’s Fury, etc… was not needed. While yes, they are doable. It’s not comparable to Legion at all.
During Legion, even above average players were pulling some of the challenges off during Tomb of Sargeras, while most of the playerbase didn’t really start completing them until Antorus. With even more completing them after the overcharged artifact. It absolutely should not be overcharged artifact end of the expansion easy. But it definitely should be tuned to between Tomb(which it was balanced for, with borrowed power) and Antorus(to make up for not having any borrowed power of which our classes are designed around).
The damage in the Feltotem encounter is way too high. That challenge feels like trying to do it back during Nighthold in Azsuna questing greens. the health the boss has is fine, but the eggs could stand to get a small health decrease. During Nighthold, Feltotem was extremely doable, even if you made a mistake here or there. Currently the tuning is so unforgiving that if you blink at the wrong time, you die. And that’s not okay.
Agatha isn’t a hard encounter, its just a battle of attrition due to how inflated her health pool is.
God Queen’s Fury was never a huge DPS check outside of bursting the one guys shield in order to interrupt him. It was about doing the mechanics and as the fight progressed, it got easier and easier until it was practically a free win once two of the NPC’s were dead. Currently, it too is a battle of attrition due to the massively inflated health pools, forcing you to juggle multiple very hard mechanic overlaps MUCH MORE than you ever had to during Legion. And that’s not okay.
The twins would honestly be in a great spot if they simply reduced Raest’s health. Even doing the fight"properly" and focusing Raest each time Karem goes down, then just blowing everything to try and nuke Raest after Karem comes up for the last time, it’s next to impossible to get Raest below 60-70% before that point. Whereas, during Legion getting Raest to 20-30% before that last phase was what made the burn possible. Now you are basically forced to kill Karem to get rid of the hands because you simply can not kite Karem long enough, while soaking runes, while killing hands, while dealing with adds, while also nuking Raest. Raest could easily use a 30-40% health nerf. That keeps the mechanics of the fight intact while bringing it more inline with the original. Opposed to the shenanigans and turtle tactics people are using now just to have any chance of beating it.
Kruul is in a “okay” spot truthfully, though Blizzard should revert the Nether Horror change for Druids. Past that, I genuinely feel like a 5% health reduction in the Inquisitor and Kruul, and the fight would be perfect. Again, that keeps all the mechanics in tact.
Xylem… his Frostbolts still need to be toned down a bit. And the boss in P2 needs his health cut by a solid 15-20%. The encounter is already a delicate dance of mechanics and damage(bursting the adds down fast enough in P2).
Risen Threat…yea, no. Burn it with fire. Nerf it hard. And then nerf that already nerfed version even more for Holy Priests. This iteration of the challenge is downright masochistic in its insanity.
TLDR: Rambled. More tweaks and nerfs are still needed to bring it inline with what the original was balanced around. And it honestly should be toned a bit easier than what the original was balanced around due to us being designed around borrowed power but having none for the challenges.