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

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.

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Here's a very basic analogy: you'll easily see the difference between a mediocre tv and a state-of-the-art tv. But if the light in the room is subpar and the sun is shining directly on your fancy tv, its image won't be as good as it is capable of being. Room treatment helps your system to live up to its full potential.

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

to make it sound even better, to make it eveneasier to get great sound. 

Translation: "I'm really lazy and treatments are a hassle so I think I'll just pretend that room treatments can never matter if you have the right system."

The room is half the equation. Ignore it and you will get the sound you deserve.

I see I see yes 

the earth is also flat because I see it is flat in my little world!