I n practice, I make a simple judgement when listening to whatever. It either sounds good or bad. The difference between the two might be called night and day, but in fact could be relatively minor. I either enjoy what I am hearing or not.
On that track, since I listen to my main hifi setup the most, I set the bar highest there. IT has to sound good all the time, allowing for variations/deficiencies recording to recording. So there is a lot more that goes into that than other cases.
I also listen to a second system, headphones, table radios, etc. in my house. Not to mention car stereo. Each of these fits the bill although to a less "perfect" extent when I listen.
Its all a matter of what a person finds satisfying to meet the need case by case.
It can't all sound perfect all the time. Expecxting that is the certain path to audiophile hell.