Because truely "accurate" reproduction of audio is incredibly difficult. You're trying to mimic the spunds of an instrument with something that isn't said instrument.
If the recording is poor, it doesn't matter how good the speakers or gear are, it won't sound "accurate."
Same goes if your recording is perfect, but your gear is poor quality.
Even when everything is good, there are still going to be ways in which it falls short from the real thing.
If there was a way to get perfect reproduction, there would be no "if"s "and"s or "but"s about it and there would be no need . But that simply isnt reality.
That's why for *literally everyone* in this hobby, it's a journey, not a destination.
Add to that you are trying to capture multiple instruments in one setting (i.e. with classical over 100 different instruments in a huge venue) then play it back over two speakers in a small room. No matter how great a stereo system is, it will not sound the same as a live orchestra in a concert hall. That’s a given. A stereo system produces an illusion of a live event. The objective is to have a convincing enough illusion that you can turn off the lights, close your eyes, feel like you are there.
Some equipment, including speakers, do a better job of this than others. For many in this hobby, the quest is to get as close get as you can to a live performance with a stereo system for a particular situation at a price you can afford. Even in the best of times I can usually only get to a live performance once or twice a year but my main open baffle system can take me so far into the music I can easily experience the illusion of the event whenever I want.
The desire to get as close as feasible to the live sound extends to situations where getting lost in the music would be counterproductive or dangerous such as the LGK desktop system in my office or the stereo system in my car. While the car system has a long way to go, the LGKs are the best speakers I’ve had in the desktop system by a considerable margin.
As someone who played trumpet, baritone, and tuba and who now plays Native American flutes (and whose father played guitar, brother drums, and sister clarinet), it is possible for a stereo system to create a remarkably realistic sound, be a total dud, or somewhere in between.