People don't want KE to be nerfed since it's not a fun class to play to begin with. If you play it how you're supposed to, you have 2 or 3 offensive spells you lean on and the rest are there just for flavor. They don't deal massive damage like the other OP classes. Their thing is being really tanky.
With that said, the people who are complaining the loudest are the ones building their KE off of everyones "omg this build owns" guide which is streamlined to faceroll stuff because the build was min/maxed. The KE is probably the best built class in the game, all you have to do is look at how well KE synergizes with the other trees and their passives. This is without even mentioning what you can do with master craft stuff.
So players set their KE up with this build then wonder why they can't die and cry about it being too OP.
Meanwhile other classes can be just as tanky and kill three times as faster. No one says anything about this because with the KE there's no ramp up speed to hit optimal build. The other classes take a bit to get their feet under them, but when they do they outclass the KE in terms of damage and tankyness (depending on the class)
The KE by default is in light armor, and gains barrier via damage. People are saying to reduce the amount of barrier they get through damage, but fail to realize that's how they stay alive in light armor. The minute you reduce the damage they do, or reduce the amount of barrier they can get via damage, they become a useless class no one will ever play. You can't nerf a class because it's unkillable after you throw a mage in heavy masterclass armor with a weapon that has +5 guard on hit. No duh it's unkillable.
The only way people are going to drift away from KE is to buff Necro and Rift Mages, right now they're very very lack luster.
I'll never understand why people complain about being OP when they use a build designed around using the best synergies and masterclass gear.
If people are looking for a challenge, then pick the crappiest class combo in the game and beat it on nightmare that way.