We all know the modern complaint: movie sound sucks now unless you have a high-end sound system. Frantically turning down the volume after turning it up to hear the dialogue only to need to turn it up again can be frustrating. Now, this doesn’t solve the underlying problem, but why not have a “Volume A” and “Volume B” you can easily set and toggle between with the simple press of a button?
I guess I’m not understanding your concerns. People with artistic skill can already do anything they want to any audio they want. (Note: that was Way before all this AI junk existed) And I don’t really see how this affects that much.
As for settings, I’m thinking three/four sliders. Much less than a graphic equalizer. It’s just volume control.