Why has ekko not been nerfed?
Ekko as of patch 10.2 has been a top tier jungler, high and low elo. I do not mean he has just been barely edging out the competition, he has been completely blowing them out of the water!
According to Champion.gg Ekko is the second most played jungler at 9% and has a win rate of 52%, the Champions kit and base damage has even allowed him to get away with running dark Harvest as the meta rune, which up until recently was always viewed as an iffy rune because it's sacrifices significant base damage for potential scaling. Due to the nature of Ekkos kit and consistently he can gain dark Harvest Stacks at virtually no risk, turning potential scaling into guaranteed scaling, with no real sacrifice because Ekkos base damage is so high.
However the biggest problem with Ekko is the Champions kit in general, because of Ekkos Ultimate Echo players can have a zero consequence play style. There are numerous champions in the game that are rewards for making the right decision my favorite example of this is Aurelion Sol. Aurelion Sol is fundamentally balanced upon making the right decision for your team, and the champion has a little mechanical difficulty to counteract that. A lot of the counter play is game knowledge and understanding how the Aurelion Sol is going to play out the game.
Because of this when a superior player plays Aurelion Sol it feels very overwhelming, for there is little room for mechanical out play when you're constantly getting out macroed.
However the champion is not without causality. For example if the Aurelion Sol roams bot and it goes bad, there is a serious negative consequence for that, or just roaming In general when the champion leaves Lane they give plates and pressure.
However due to the nature of jungle in low ELO there is very little consequence for having poor positioning, at worst you lose a dragon if you show top at the wrong time.
So for example if an Ekko randomly decides to gank top even though dragon is spawning and bot lane is winning, he will still get a dark Harvest stack or a kill, even if he's ganking a full health Renekton who has been winning lane all game, because there's no possible way for the Renekton to actually kill him or punish him for his mistake. If the Ekko takes too much damage he will just use his ultimate to regen and reposition, if the Renekton hard commits there's a decent chance that he ends up going 1 for 1 or 1 for 0. And yea maybe your team gets dragon, but so what. Its 1 dragon. Unless its a water dragon it will not impact that lane phase significantly.
Even if you counter gank an Ekko it doesn't matter the second he realizes he's out of position he will just ult. And yeah it's like as an Ekko that's frustrating to not get anything but as the entire enemy team it's it's frustrating to not get anything, but the real problem is that any champion in the game other than Ekko would have been dead for making the poor choices, Ekko kit has created a champion that has virtually no consequences for his actions, even the most idiotic jungler will go even because it's impossible to go negative on Ekko.
It's like bad Ekkos don't get punished for being bad they just don't get rewarded for being good.
If I was playing Lee Sin and I got counter ganked after committing to a gank I would be dead. if I was playing Olaf and I Tower dived and they used barrier I would be dead. if I was playing kha'zix and I jumped over the wall into the entire enemy team, dead. if I was playing Rengar and I jumped into the Baron pit with flash down, dead.
But if I was playing Ekko in any of these situations I would be just fine.
So whats the trade off?... Exactly
The base cooldown for Ekko ult is 110 seconds, which means approximately 1 and a half clear in between each ult, The jungle item will give him 10% cooldown reduction so his ult is normal base 99 seconds, because he will have runic Echoes by the time he hits level 6 or 7. So Ekkos ultimate is approximately 1 minute and 30 seconds, Gromp spawns every 1 minute and 40 seconds, so an Ekko that understands his pathing will have his ultimate Almost 100% of the ganks he makes, making it to where there's no compounding interest for screwing up over and over again. On any other Champion if you go into a lane and just int you have to flash or die, which makes it to where going into another Lane and screwing up again means you die. Ekko does not have this problem.
The worst part about all of this is the only part about Ekko that takes skill is the one part that doesn't really matter, that is his W because he is being played as a jungle right now he doesn't actually have to land a W in order to a ensure kill, as a mid lane Ekko it's important to land your w else you'll just get cc'd and the person will combo you and walk away, and you hard lose the trade.
However as of late playing Ekko as a jungler has completely remove the skill expression. All he has to do is W in the general vicinity to get it big ass Shield, and then if the enemy chooses to CC Ekko it doesn't matter because he has a huge Shield and he still has a laner to keep doing damage to punish them for choosing to CC the jungler. In addition to that there's no reason to set up a big Womb ults where you kill the entire enemy team, because presumably you have a mid laner that's doing decent. Hoe is going to do that anyways.

I don't get paid to balance league, however I have thought up some ideas.
- His movement speed gets nerfed to make landing W more impactful. His W could even get a buff like maybe attack speed when you stun a Target, Or damage amp.
- His Ultimate Health gain gives significantly less health, this way when you force Ekko ult out most of the time he's also going to have to recall, if he had made a gross mistake. this will allow your team to raise Tempo and force objectives, adding slightly more consequence to Ekkos actions.
I feel like Ekko is an example of poor balance and Design he seems very out of line with the game design values specifically impactful decisions, I understand that a lot of this is what Ekko is supposed to be a champion that removes his consequence, however League of Legends is also a competitive game. At the moment it feels as if a Ekko is a champion that just rolls the dice until they win, except unlike every single Champion there's no consequence when they roll 1, they just get to reroll, and when they roll a 20 they win the game. Do you feel the same?
et caetera. How can you believe they want balance ?