I don't see what the issue is
1.KE is melee mage designed to be survivable in the front lines.
2.Since it is not wearing Heavy armor that survivability comes from spells
I am fairly certain the people who cried about Arcane warriors are now crying about KE and they have themselves to thank for them KE. If this was PvP game how would you stop a KE you would dispel it to death.Now the AI isn't smart enough to constantly do that and don't think encounters were designed in mind for stop KE specifically.It is not that class imbalanced so much the game does not punish KE playstyle as much as it should.And the game will never because people keep complaining about OP instead seeing the big picture, In encounter that had lot of things that could dispel,drain mana,disrupt,how hard would be for KE.You guys never let the designer go back to table with class design in tact so they could put more of things in the game to deal with unique classes they made.
I love the play style of KE,Fade step in freeze stuff,Winter grasp,Spirit blade,Fade cloak or fade step out of danger. Constantly moving jump into thick off the enemy as mage. Warrior/Badass/Jedi Mage that play-style should be protected at all cost regardless of the min/max guys who figure out how to make Spirit Blade as effective as possible,put on the best light armor possible,figure which abilities from other tree help KE the most and go out and solo dragons.You know what is boring for me standing stuck place as mage and going pew pew pew rotating through your spells.
Note I am not saying something not need to happen but the words "OP" suggest large scale changes which possibly will change how class plays or the intent of the class.The intent of this class needs to stay in check a survivable front line mage with the magic sword.Yes melee mage has start to become a thing in these game but are pretty unique Arcane Warrior was a Mage in plate armor, I played Herald of Xolti in AoC that was Burst damage Mage that get taken over by a Fire God,KE is front line mage based on magic protection. The point is fire,Ice,lighting mage play almost the same from game to game.KE is unique playing style which far different from the other mages in the game or even melee mages in other games.
I am tired of losing signature lore inspired classes instead unique Blood Mage we got a generic horror corpse bomb Necro. Instead of my Arcane Mage in plate armor(always best looking armors) I get KE which something different.We should be protecting unique playing style at all cost even if they are "OP" because if you have not notice they get taken out of the game instead balanced.I don't care what anybody says the game is not better off not having healing,Blood Mages,Arcane Mages,Bards,etc.This is a single player game you are looking for a challenge don't be KE and don't use Viv.