CC needs diminishing returns
Chain CC in the game has gotten beyond being ridiculous. You can now CC someone for 6+ seconds with little if any counterplay.
It needs to be that the first CC lasts the full duration, the next one within 3 seconds would be half duration, and then you are immune from CC for the next 3 seconds.
EDIT: I am referring to hard CC like knockups, stuns, etc. Slows are fine and definitely don't need diminished returns with the huge mobility creep the game has.
This would allow actual counterplay and make the game so much more fun IMHO.