Well, I know you said you didn't want to open it up regarding YouTuber reviewers, but Hans Beekhuyzen has three "reference" systems. In his world, "reference" means three price points such that all components in each system are matched to each other in price. In other words, he doesn't put a $10K DAC on a $1K integrated amp and $500 speakers. And yes, at each of these three price levels he switches review pieces in and out and lets you know what he hears and which system they are most likely a good fit (or not).
What is a "reference" system?
OK, most of us have an audio system, mine even works some of the time. But I see that some members have "reference" systems. This has to be better than the assorted junk that I have piled together. Probably a lot better than your rig as well.
But really, what distinguishes these folks "reference" systems from the pedestrian systems that the rest of us have? There must be something, or they could just save the keyboard time and drop the word when discussing their gear. And I am not referring to reviewers, that is a different story and one to examine more carefully in the future.