What the fuck is a diminishing return?
Does it make money?
... No?
Well fuck that then! CC chains are healthy for the game!
Sure is fun being CC locked into infinity while the ZERO ARMOR PEN ADC DOES HALF MY HEALTH PER AUTO. But you know, that's only fair, healthy, balanced gameplay.
There's a reason MMOs have DRs, just saying.
Edit: Since I know most people have no clue what a DR is... Say you have a bunch of CC spells that last 5s each. CC 1 lasts 5s. The second CC would last 4s. Next would last 2.5. Next would last 1. After that, any additional CCs have no effect for a few seconds. Then it restarts.