Scaling Crowd Control

How come more stuns don't work like Xerath's? He's a long range artillery mage who is actively punished if someone manages to break his safety net by his stun duration being reduced the closer you are to him. Why can't Zoe's bubble be the same? Or Morgana's Q? It seems like a good idea to reward (especially immobile) melee champs for getting where they need to go without punishing mages or supports for doing a good job and keeping them faaaaar away. Edit: This could also improve bodyblocking to feel so much better. If your 6K hp Sion steps into that Brand stun to protect your adc from instadying, he did a great job and should be rewarded.
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