I'm limited in the amount of treatment I can do in my listening room. The walls and ceiling are all 1950s knotty pine, and I'm not about to cover that up with acoustic panels. I experimented with speaker placement and laid the furniture out to make it as easy on the sound as possible, and then EQed the rest of the way. It works fine. Room acoustics aren't an absolute thing. You need to trade off and make compromises so the room still works as a living space. In that sense it's different than designing a recordings studio. I have really good headphones, but even my bookshelf system is more enjoyable to me than my cans.