Visual noise

Riot - "The reason we don't have one is actually for the sake of clarity. While adding more effects, indicators, etc can result in improved clarity there is a cost to doing so which is increasing visual noise. There is only so much screen space and so many places, objects, and moving pieces a single players eyes can follow and interpret in a given scenario. Once you hit that threshold any additional effects or indicators either get lost or visually clobber another important gameplay effect. It can be as helpful, if not more helpful, to remove or reduce the size of existing effects in improve clarity rather than add or amplify existing effects.

In this specific case a giant frozen circle ring would almost certainly cause more clutter and obfuscate more desired effects than improve overall clarity. Though it would feel pretty cool for the purchaser (which is important) the clarity cost by adding that much visual noise was high enough we chose not to do it."

Riot's next champion is gonna be loud https://i2.ytimg.com/vi/2Go-E6rjCKA/mqdefault.jpg