I love this discussion
Wheather or not a track is authentic as an original in a studio, or if it is by default always the listeners setup that defines what is true then and there.
There is no one right answer in all regards, as the question/premise changes, so does the perspective.
I stand by my belief, that the artist will label (or disapprove) the music as correctly sounding in the mastering studio.
Then yes, there are different ways for a master engineer to "view" the sound (mono, polarized, centering channel aso.) But that is not the final product.
Yes they do try the music throug different speaker setups (headphone in-ear and above, Bluetooth speakers and full stereo) as measurement.
But what the artist hears as the final result is throug the studio speakers.
What I'm aiming to say, is that if you have a HiFi stereo setup for $100k and get your hands on the master reel. You can't get it to sound More authentically real or true, than in the studio where it was recorded.
That says two things.
1. If the artist chose to master by selfe, the probability is that your 100k rig will "over play" how the music was intended to sound. (You preference.. not the truth)
2.
And that 100k rigs probably wont play all kinds of music "that good", since all masters aim for different sound picture depending on the authentic room setting and target audience music gear.
And since we can't all reproduce all different studios everytime (yet...)
I'm saying, that as long as you have good basic quality (one that doesn't degrade the original master too much like soundcloud 128 kbps mp3), the rest is up to your preference.
And you can save thousands of dollars on that philosophy alone
(regardless of weather different type of brands try to sell their stuff as "The Purest Audio")
...but that philosophy is no fun