I don't understand why people would want to hide nice speakers behind a wall, I want to see my expensive speakers, but that is just me. My speakers are about 6" away from my front wall.
Just a matter of preference. For me I like the seamless look of a theater without seeing the speakers and just hearing them. Again, a matter of preference, but I don't need the speakers to look beautiful for my purpose - I just want them to sound good.