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?
You underestimate big tech. Judging by the headache inducing track record of AV technology, this would end up as yet another garbled mess of eleventeen different competing codecs with bad implementations, inconsistent specifications, misleading marketing, horrible licensing, and predatory DRM.