Most rooms don’t need acoustical treatment.


Why?  Because acoustical treatments presented are in virtually empty rooms. Unrealistic.

my rooms have furniture and clutter.  These rooms don’t really have a need for treatment.  It’s snake oil, voodoo science.  
So why is accoustical panels gonna help?  No one can answer this, most have no clue.
jumia
Hear, hear MC. Absolutely right.

And even acousticians and psycho-acousticians admit there's much they don't know or can't explain. But this is true in every field, including the ones that collectively put men on the moon. 
Mofojo is right.  We do know how a car works.  On the other hand, we don't know why someone prefers a blue one to a red one, or a Camry to a Prius or why anyone  likes the Fiat 500.  (Well, maybe in some cases we do--like why I prefer my 88 Volvo wagon to anything built in the last twenty years that would cost me 30 or 40x as much).
You wouldn’t happen to have a blue 88 Volvo Wagon and live in West Mi would you?