Somehow I think if you have a good system in a furnished room somehow you have to validate yourself as a true audio connoisseur by putting stylish acoustical panels throughout the room. Somehow not having them makes a room seem unfinished even though it may sound perfectly fine. I think people are hooked on getting acoustical panels in their furnished rooms and may just live with them after they get them because removing them is something they probably just wouldn’t do. A diffuser panel of 3 x 5 in a furnished room room hardly does much of anything, but it can look really really cool. I would have one but I’ve never found anything that I’ve really want to put up on the wall.
I think everyone’s been conditioned to assume they should pursue acoustical panels even though many can never really discern a difference in a room that’s furnished. . Walking into a room with a nice audio system without acoustical panels and someone will say oh you need acoustical treatment.