I know I'm going to get downvoted but I think Tanks are just as much of a "problem" as ADC's
They're both sides of the same coin and if one of them are "strong" enough to warp the game into a Tank or ADC Meta everyone who doesn't play either one of them is going to be miserable.
Tanks in particular don't work in this game because unlike MMO's they can't just be aggro magnets due to their lack of actual taunts and humans knowing not to attack the beefy targets. Couple that with good base damages and extremely reliable cc they become a nightmare as you: A) can't kill them B) They still win the fights due to their innate base damages and being able to survive long enough to get them off C) Once they're ahead they can just roll you over with reliable engages and there's nothing to be done to "outplay" them D) You need a TON of pen or dedicated tank busters to kill them
And then there are ADCS. If they're good they just kill everything from 600 range away with minimal counterplay to them due to the nature of their reliable AA based DPS. They share the same issue as tanks since most of their "perks" are reliable and don't offer a ton of ways to outplay them.
Oh, and don't try coming up with counterplay arguments like A) just STAY out of range for tank engages or B) just engage on the Adc
because that's just as binary as these two classes. Mages, as much as I dislike saying this, are fairer due to the nature of their kits and most of their stuff being really unreliable. Unlike Malzahar, which is why he's become one of the strongest and most opressive mid laners.
with CoTC as part of his passive and he's building lethality.


is.
all have escapes.
Also, "lack of self-peel" is true of quite a few ADCs, but not all, and of that do have self-peel also have escapes too.