@Riot I don't think you got Ekko nerfs the right way
So his W ability, besides all else, reads:
If Ekko enters the sphere, it detonates, shielding him for 2 seconds and Stun icon stunning all enemies inside for 2.25 seconds. Ekko can detonate the sphere even while dead or untargetable.
Ok, this big AOE stun doesn't exist in any other champion's kit, and it certainly isn't 2.25 seconds flat. What comes the closest is Leona's ulti, which has smaller AOE radius, and it certainly isn't on 14-22 seconds cd without cd reduction. Granted that Ekko gets at least 30% cdr with Iceborn Gauntlet+Spirit Visage, this ability has 9.8 cooldown. I think this is what makes Ekko unmatched as a tank.
He has overloaded kit, and these 6.10 nerfs made him a bit weaker, but as long as his W is this game breaking I don't think his ability to dominate as a tank will ever come to end. There were some talks about making his W stun scale with ability power, thus force him more into building AP if he wants utility, which I find quite good. I don't know what happened, but Riot didn't include it in this round of nerfs.