my rooms have furniture and clutter. These rooms don’t really have a need for treatment. It’s snake oil, voodoo science.
If your furniture addresses all the acoustical issues in your room, yes. However, that is somewhat doubtful. Many home theatre setup have auto IQ systems precisely because very few rooms are acoustically neutral.
I'm normally a person that scoffs at measuring equipment as my ears almost always proves the measurements to be of no value, but acoustics is an area where measurements by and large correspond with our hearing.
If you take a simple sound pressure meter (i.e. decibel meter), you can feed different frequencies into your system and measure the sound pressure (volume). You will see swing of 20db, 30db, sometimes even more across the audible frequency range, and these swing will be differ in different areas in your room.
Addressing some very simple things, like the first reflection point will dramatically increase the focus and sound staging of your sound system. The changes are not subtle. You'll be bowled over by just how good your system really sounds.
Ps. A little stone or clock in the corner of the room isn't going to do it. Have a look at what the pro audio guys do.