Gbmcleod,
I agree with what you said and would like to add something.
My all time favorite listening experience was with the mbl's. Before I get darts thrown at me let me just say that whatever was playing I got into it. I found myself enjoying rap and hip hop, music that I never liked, but the mbl's presented it in such a way that made me enjoy it. That was the case for all the music played. So when Gbmcleod mentioned musicians don't look for "more bass or better soundstage", neither did I when listening to the mbl's, probably because my ears didn't have to fill in the voids or missing nuances or details whatever cues we hear when listening to the real thing. Therefore that is the holy grail for me, thankfully I have it now so I don't need the mbl's , but I do need a larger room, life isn't perfect.