'Laid Back' to me refers to a lack of artificial brightness, a lack of added odd-ordered harmonics, IOW the system has no loudness artifacts and will play in an effortless and authoritative way without generating the desire to turn it down. Laid back is where your SO asks you to play more tunes rather than to turn it off.
Laid back is essential if you actually listen to your system and expect it to do what it should do for the thousands of dollars that you have invested: draw you in to the music.
Laid back is essential if you actually listen to your system and expect it to do what it should do for the thousands of dollars that you have invested: draw you in to the music.