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?
There is absolutely a standard volume max. Unfortunately loudness isn’t that simple.
You can have something that peaks in decibels that you can barely hear and sounds that are the same decibels as talking, but sounds ear-piercingly loud.
Your TV can only set and perceive level, or “decibels” of the input signal. Sometimes they can have smarter tools like compression, but these are rare and when they are there, usually poorly implemented.