I lost a teamfight because Evelynn muted my sound effects.

The w sound mute is part of its intended power

I'm confused people are arguing with you. It IS harder to play without audio. Audio can discern more sources at once and reaction to it is 0.1 seconds faster for most people.

Evelynn's probably balanced around this, but it is super frustrating.

So shebmuted your pings?

At least you can still click on stuff, right? Graves doesn't even let you do that if I know what I'm going on about.

Pretty sure Evelynn cannot mute your eyeballs. Saying "I lost a fight because I can't hear" is like saying a deaf person can't hold up a conversation for the same reason. Deaf people can hold up convos just fine because they can still SEE what others are saying just like you can SEE what is happening in a fight. Riot has specifically made visual cues for pretty much everything in the game, so there is 0 excuse you can make as to why you lost outside of your own inability to perceive with your eyes. Scrolling through the comments I seen you say

There's a big blob of champions firing skills and cc I'm supposed to dodge.... And I can't even hear my own autoattacks and cancel them properly.

Did the audio mute make you forget how to right click? You shouldn't be sitting in a "blob" of champions anyways unless you're a champions that thrives in them like Illaoi.

Honestly speaking, everything I've seen you say in your post and in the comments points at it being your fault you lost. You couldn't keep track of your champion's animations and you were in the middle of the enemy team complaining about how you couldn't dodge their visual cued CC you should automatically visually search for on your own.