Do we really know what "Live" music sounds like?

It seems that most people set up as the standard to compare their systems to; "sounds like live music or an instrument they are familiar with. That certainty is a noble aspiration, but in my opinion impossible to meet. An audio system is a series of electronic pieces of equipment trying its hardest to sound like wood or metal instruments in which string are struck, bowed, plucked... or blown through with small pieces of wood vibrating or air from the musicians lungs flowing through complex passageways and escaping out the other end. How can pieces of electronic equipment sound "just like" this complex system that generates music. To add to this what is the listener basing his comparison to? A concert attended to in a specific hall. First audio memory is extremely fleeting. I forget exactly how quickly it fades but it is seconds. Second the musical instrument that you are saying your system sounds exactly like will change it sounds based on the size of the hall, how filled the hall is with listeners how many other musicians are around playing, the humidity etc. These influences all affect the sound one hears so one piano played in one location will not sound like another piano played in another location not to mention who made the piano and how in tune it is. Now you play this recorded music in a living room, your basement, a dedicated listening room, a room that has been treated one that has not been treated etc. All this makes me very puzzled with how people tout how their system reproduces music just like what they heard at such and such concert. The best one can say is my system is extremely musical and gives me the impression of what I remember instruments or a concert sounding like. You can talk about decay, harmonics and on and on which are all very important for creating a live accurate sound but one can only approximate the sound of an instrument and will never truly sound like that concert you fondly remember or that instrument you play. The last item I always consider when listening to a review of how great a system sounds is that everyone hears the same sounds differently.

When I listen to my system or another, what I listen for is the sound stage, pin point localization of the musicians, decay, harmonics, detail, how deep the bass goes and is it details or just one note bass, mid-range beauty and many other details that appeal to me and therefore makes the piece of music enjoyable. A lot of times, particularly if it is electric rock type music I say, it sounds better than going to a concert. If it is classical it can still sound wonderful to my ears and warm my heart, but I cannot get out of my head that I am in a much smaller room and no matter how wide the sound stage in all directions it never sounds just like being in a large concert hall, but still very enjoyable. The bottom line is I build a system to appeal to my ears, room, and budget with the end goal of a very enjoyable listening session for me and anyone else who comes over to listen, but never do I believe it sounds just like a concert I had attended. As @runwell mentions above, it is a great imitation of a concert I attended or maybe even better in the sense that my room is very comfortable and with good acoustics since I have spent a great amount of time and thought in treating the room, but at 12' by 15' it has it limitations.