Why I think the "complexity" reasoning against Lee Sin and Zed nerfs is flawed

Riot has recently made clear what their stance is regarding complex champions like Zed and Lee Sin. If I were to roughly summarize it, they justify their strength with the fact that their kit is hard to master and has a lot of room for error, and thus they deserve their high reward when mastered.

And here is why I think this alone cannot justify the stance, or rather, it does justify, but overall is bad for the game. League of legends is 5 years old. And it is aiming for more than 130-140 champions. With so many different champions, it's inevitable that Riot will never be able to keep them on par at the same time. In a utopian world, where even the least skilled champion has enough room to improve and mastery to rival Zed, the fact that zed is slighty ahead can be justified. In a game where we have Ryze, that argument holds no ground. it essentially means that champions that don't have that number of tools don't deserve to be mastered or played, because since their strength comes from their kit and not their player's ability, riot will nerf them once they get play. Fizz has quite some room for skill, and was hit really hard in the last patch. Basically it means that, when you decide to main a champion that is not Lee Sin, Orianna, Zed, or one of the few champions overloaded with abilites, options and tools to adapt on every situation, you have to rely on the patch balance to get ahead, and once you do , the champ gets nerfed, because it's not "your ability" is the champion. Again, it's an extreme, but it quite summarize what Riot is doing with the latest nerfs and their stance about Lee Sin and Zed.

While it's true that those kind of champion do have a higher skill ceiling, whose fault is if champions like Ryze have a lower skill ceiling? People start to play and main champions because they are captured by the theme, the feeling, the art, the voice of a champion, but it ends up being destroyed because you overleaded their kit in the start, and only later realize that his/her kit hasn't enough room for rewarding a player growth. Look at Garen. Look at Ryze. Look at Kayle. Look at a not so old champion, Diana.

It's fine to have champions who are harder than the others. It's not fine when those champions are rewarded more, because it essentially means that all efforts in learning other champions are wasted.