If you have a nice system why do you really need room treatments?

@emergingsoul the answer to your question will probably be found in more… reflection 😉

There are two aspects to room treatment. One is to improve the balance of the frequency response and minimize room modes, mostly on the low end. This generally requires both diffusion and absorption. Not all rooms need this, and it can be addressed in different ways.

The other, and more important one is to reduce room reverberations in the mid and high frequencies that smear the sound, and add the sound of your room to the sound coming out of your speakers. This can be accomplished with absorbent materials. Most rooms can benefit from this and can take your sound quality to another level. It doesn't have to be complicated. Furniture, carpet, can help but placing 4-6" deep absorbent panels strategically works wonders. And they can found with all sorts of decorative looks. 

You missed the very important time element….. the ear - brain needs X ms to ID….

RT where T = Time

Many of the Products produced to be used in a Audio System are tried during R&D stages in dedicated demonstration spaces.

These Spaces are all about not producing sound that is being corrupted by the types of condition that are to be met in a Typical Listening Environment used by a purchaser of goods.

Once a Product is purchased, there are some products that are not designed to be at their best presentation when used in their new environment. As the end sound can't deliver as it had at the stages during the design, due to the influences caused by the Room and Set Up within the Room.  

Room Treatment is a simple method to attempt to enable a end sound be produced that is a resemblance of a Sound be created during the design stage.

Note: resemblance to the produced sound is the key word not, a match for the sound produced during R&D Stages. 

To not attempt to optimise the room for the audio equipment in use is absolutely fine, music is still being produced.

To attempt to optimise the room for the audio equipment being used is also absolutely fine, music is still being produced, but possibly ? with less influences produced by the room and room set up.

Reflections , I have 10 , 1st reflections from the front, in corners Bass traps which can create boominess ,then directly behind ,carpeting Always recommended in front at least for slap echo off floor onto ceilings . Some people with $$ like my brother have the whole room treated and looks neat it’s a dedicated multimedia room but that’s over $10 k . 2x4 room panels are under $100 each 2x2 behind on walls is good also. They come in different  color fabrics , even with art work on them ,which I plan on buying to make the man cave more presentable to the Mrs..

the room is more calm and refined , plants too help as defusers ,you see them at shows.

.