How do you "measure" your end game system?
We a microphone and measurement would be one way.
Certainly for doing room treatments. And sometimes for ferreting out ground loops and wiring dramas.
Is it by budget, how much it cost? Is it by the luxuriousness of your build and room?
Some luxuriousness helps. Some people do not have a purpose built room, but cabling things up and attention to wiring and moving away from a rats nest can usually help for not much $.
Is it by your components being either state of the art or unobtanium? Is it by the satisfaction you get when you are sitting in your listening chair?
The later for sure.
But having a state of the art system (or part of a system) is not a bad thing.
What is your end game system and how do you know when you have reached it?
I thought I had an endgame system in the 80s, and replaced part of it in ‘99.
Then replaced part in 2022.
If one puts it together somewhat thoughtfully then it should either be pretty quickly apparent that it sucks, or it should be able to provide years of enjoyment.
There is little sense in replacing it all willy-nilly if it continues to make good sound.
There are meals, trips, etc that can all make use of funds, so “perfection” can be the enemy of “good enough”.