Have you listened a completely dead room and a completely live room?
I am not against any room treatment. But saying that room treatment is the only way to achieve sonic bliss - which I disagree.
As per my previous post, doing a diagonal room placement for speakers and listening position (like mine) you can completely avoid the first reflection reaching your ears. Also the speakers are facing both the front and rear wall in an angle, so any standing waves in mid and high frequency is reduced. Reflections if used Judicously helps in spatial resolution and spaciousness. Managing the late rare reflections by careful placement of objects in the room helps in even dispersion of HF giving concert hall like expansive open sound. All these can be done without any purchase of any absorbant or diffuse materials. It just requires a proper review and approach to room treatment and not blindly following what others are doing.
If you wish to discover more, then PM me.