Outplay = Unbalanced is Skill = Unbalanced
Outplayability champions are the most hated in league of legends, but what the boards fails to realize is they are also considered the most fun (hence why they always have high pickrate and even winrate, they dont always win but the champion kits themselves are undeniably fun to play)
The issue with these champions, and why for whatever reason the boards jumps into action seemingly at random is because in some cases the champs become easier. "BUT HOW COULD THAT BE WITHOUT ANY CHANGES TO THEM?" Simple, a lot of these champions become powerful during major item or meta shifts. These changes and shifts (especially items) Can cause some champions to become significantly easier to play.
Thats why vayne hate has been the thing, because crit is back and vayne is a great crit adc. When armor pen was the adc build vayne was outclassed by most. Yasuo got hate that has continued to now because of the tank item changes and fighters/assassins being able to get REALLY tanky for no penalty in damage (which for the most part is fixed on yasuo.) The same issues happen with Lee Sin only the tank items AND the recent lethality items both strengthened him which is why he became strong.
So you arent upset that difficult champions have strong kits, you have upset when these difficult champions become easy.