There is a need for Twitch to implement a native audio compression tool to every stream, that users can toggle on/off to bring the audio ranges more in line. This is already a third party tool that's available and is incredibly useful on the user end that helps boost the lower audio ranges and decrease the screams/loud sounds.
While it can be informative to tell the streamer that certain parts of their audio is higher/lower, the user end setup can produce different perceptions. Having a native compressor tool on Twitch will alleviate that issue so that each user can get a better audio experience, less rip ears, etc.

Twitch's current audio options are non-existent, and it's important to keep improving in this area as Twitch is a mix of visual, audio, and live interactive experiences.