It says a lot about balancing quality when some champions are dead.
Corki was broken in some seasons and is now DEAD. Seju was picked a lot, now dead. Aurelion Sol, nobody plays him. Trundle, nobody plays him and dead.
Why was these champions played before? Because they were too strong. Now nobody plays them. Which means that they have no mains.
Corki has 0.8% play rate, which means that much mains. Seju 0.7% sol 0.6% trundle 1.2%
Before they had 20% win rate and riot was not nerfing them. What happend? Where are those 20% of mains at? xd
Riot should learn, that there are some champions, that are not popular and if their popularity increases in a magic way, it is not because people like the champion, it is because he is broken as hell.
For comparison, Ryze is tier 5 champion, He is garbage at the moment with 44% win rate. 5,4% play rate. People like him. I like him too, he was in League since I remember. Mr "never ending rework" is a champion that I consider a core of this game.