So I wonder, if champs like akali/kat get gutted cause they're easier to play

What happens to champs like fizz or ekko or zed that somehow "more difficult" (despite having the exact same amount of keys required to play) allowed to be OP/broken/safe in terms of assassins? Is it because noobs are better at the first 2? Always wondered what justified the kat rework and then the gutting of akali's kit. But not champions that have plagued mid and top for 2-3 years since their release and still are played despite some small number nerfs/changes that really didn't change how you play them(for example actually having to land fizzes ult to kill someone and even then its still not needed because his W is still free percentage damage..)

Just wondering what justifies the gutting of other champs but not others for the sake of curiosity. Honestly makes me salty cause I like the season 1 champs far more than anything released after season 1 gotta be honest, they're way more fun to play for me but they all seem to get nerfed into the ground eventually just for the sake of being older without any other real context other than because "we don't want it to be played because it's not flashy as fuck" outside of leblanc I think alot of the older champs are simplier but why does that matter in a game where it takes 4 keys to use your entire ability set and thats it. Just seems dumb to justify it with "it's easier" because everything is easy in a moba, you get 1 character to worry about and hardly any keys to use to play them when you actually break it down and look at it objectively.