When we are not satisfied with a system there is two possible reason:
Frustration...
Boredom...
Ok those are two reasons. Are there only two? How about:
It’s fun to mix and match and do all the connections...
Fun. Fun is a reason.
So now it looks like three possible reasons.
Maybe there is even a fourth! Or a fifth!
About immersiveness (or "immersion" I would call it):
A high end system in a dedicated room will do better with an improved immersiveness for sure than my low cost one. But trust me we can live with minimal immersiveness.
There is what "you" can (or have to) live with and then there is "we." I can speak for "me" and some of my audio friends. What one can "live with" is not the end point with me (or us). And many others here would probably agree that they would rather seek better sound than "live with" the minimum. To each his own but that’s my two cents.
Once I identified how to achieve immersion and excellent sound qualities, I began to hear these aspects in other sound systems. In some cases, the gear was the difference which made a difference.
To be clear, I know this is a high-priced hobby sometimes. But it doesn’t have to be. But while very expensive gear is not a magic solution to getting better sound better gear is a very important element. And long posts about acoustics and the brain don’t justify ignoring the gear factor. If I cannot afford better gear, I just admit it or try to find something used or in kit form. But gear matters when all other factors are nearly optimal.
That’s why I don’t want to settle for "minimal" satisfaction. I find it an enjoyable part of the hobby to seek better sound.