WAF... the dog that does bark!
Acoustic treatments are avoided because of room aesthetics. A hard wood floor with no carpet is the worst offense IMO. People who paid for wood floor will NEVER put carpet on it. It will remain acoustically untreatable. Just horrible imo.
Windows are the next problem and have more solutions but the look of the window is far more important and most are very reluctant to cover it.
I've also found people don't like the look any acoustic panels or bass traps on their walls. Most people don't think it makes that much of a difference if any.
They get used to the room acoustic the way it looks best and that's the way it will stay.

