Interesting turn of discussion here... I am quite in agreement with Dertonarm regarding the differences between sound and music reproduction. I have had a number of profound "moments" over the years with cheap sound systems, as well as great ones, and in concert halls (no preference, in those cases). In these moments one doesn't think about the sound reproduction anymore--the message is in the music. In fact, I would contend that, if possible, the best way to hear music is by reading a musical score (or playing it), when possible; no intermediary, human and/or mechanical. But that's another story...
To me, one of the fundamental advantages of the live event (or the musical score) is that you can choose what to focus your attention on. Sometimes, what is most moving in a piece of music is pretty well hidden inside the texture and that, most often, will not be revealed by mechanical systems of low-ish resolution. It might not be the case for Beethoven's op.132, granted, by Schoenberg's Pelleas?? It's not just a question of getting the sense of space, dynamic range, etc; the problem is mostly that on car radios, you can probably hear the main tune, perhaps the bass line and a bit of something else, but unless you already know from past experience what's inside those thick textures and therefore can somehow "make them up" as you're listening, you aren't going to get much of it. My point is that one reason to strive for higher resolution--for me!--is to be able to have the same kind of choice when I'm listening to a recording as I do in a (good) concert hall: sometimes I want to pay attention to a secondary line, or further inside because it says something more important than the main line; or because I hadn't noticed it before. Or I want to hear specific notes inside chords because they lead to something unexpected; or whatever... pick your favorite music, that works just as well. Those things are an integral part of the musical experience.
Then, again, sometimes, it's the most obvious stuff that moves you, and then any old system will do, I agree.
Music is a source of knowledge as well as of enjoyment.
Joel