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

Disagree.  If the reason is the pursuit of the best sound the system can create in that space then it has nothing to do with being conditioned to think acoustic treatment equals true audiophile.  What is the definition of sounds fine by the way?  There are plenty of videos online you can watch and hear the massive difference in the before and after.  I don’t want to treat my room using furniture, I want to use acoustic treatment designed specifically to manage issues I have in my room.  I have no idea what piece of furniture I need to add in order to manage a +3db rise at 50hz.  However, I can do some research and find acoustic treatment that can help flatten that out.

The OP has an opinion, is not forthcoming with relevant information, and shows no interest in "better understanding" as claimed.

No reason to continue this circular firing squad.

I hardly think of a room filled with furniture is considered a treated room. Certainly it offers acoustical benefits.

The title of the thread does not suggest the system would be placed inside an empty room. It merely suggests that good systems, or really good systems, may do an excellent job regardless of acoustical panels, or‘treatments’ placed about the room.

Reaching to a textbook to help figure out whether a situation sounds good or not may be helpful to some but I trust my ears to tell me what’s going on. I just feel people go nutty with acoustical treatments sometimes and somehow people are inclined to put a lot of acoustical panels all over the place. And gradually the room changes it may not always be for the better and people may not really recognize this. I’m tempted to remove the corner bass traps to see how things might change but that’s a pain to do, so for now I’m hopeful they benefit things. My curve for the subs seems perfect, I guess you could say this is a helpful confirmation but I really didn’t need to see it based on what I was hearing. I’ve learned to trust what I can hear. I still would like to find a nice diffuser panel but having trouble finding one I like, and I'm not sure how much it will really do.

@emergingsoul

"Adding an additional absorption panel in a 20 x 18 room that’s furnished is extremely hard to discern. Maybe Superman hearing would do it."

"Reaching to a textbook to help figure out whether a situation sounds good or not may be helpful to some but I trust my ears to tell me what’s going on.....My curve for the subs seems perfect, I guess you could say this is a helpful confirmation but I really didn’t need to see it based on what I was hearing. I’ve learned to trust what I can hear."

One minute you state you need Superman hearing to determine the impacts the next you’ve learned to trust what you hear. You constantly contradict yourself ,and frankly dig yourself deeper in the lack of credibility hole.

This thread was utter nonsense from the start and has only gotten worse and more pointless so why keep adding to it?  Please just let it die.